How to Use AI Cold Calling for Event and Webinar Registrations

Getting people to register for your webinar is only half the battle. ON24's 2025 Webinar Benchmarks Report put the registration-to-attendee rate at 57%, which means more than four in ten people who sign up never show. And those are the ones who said yes. Most of your invitations never get that far, because they land as one more promotional email in an inbox that is already overflowing.

Here is the tension every event marketer knows. The channels that scale, email and ads, are the easiest to ignore. A real conversation is hard to ignore, but you cannot personally phone hundreds of people to invite them to a webinar. AI cold calling changes that math, though not the way most vendors pitch it. Done well, using AI cold calling for event and webinar registrations is a Pair Selling play: AI handles the volume and the warm, opted-in calls, and your reps spend their time on the accounts that deserve a human voice.

This guide covers how to run it the right way, the part most AI SDR tools get wrong: who the AI should call, what the script needs to do and how to stay on the right side of the TCPA. For the bigger picture on how AI voice agents fit into outreach, start with our complete guide to AI cold calling.

Key takeaways

• Most invitations die in a crowded inbox, and even among people who do register, ON24 found more than four in ten never attend. A live call cuts through where another email cannot.
• Under the TCPA, AI calls are for warm or opted-in contacts only. For events that is an advantage, because your best registrants (past attendees, customers, engaged contacts) are already warm.
• This is a Pair Selling split: the AI Call Agent works the warm list and sends the email invites, while your reps make the personal calls to cold, high-value accounts.
• Layer your touches, email, then a call, then reminders close to the date, and measure show-up rate, not just sign-ups.

Why a phone call still beats another email

An email invitation lands next to a dozen other promotions, and the reader's honest reaction is "I'll register later." Later rarely comes. A phone call works differently. It reaches one person, by name, and asks for a decision while the value is still fresh.

That immediacy is the whole point. Email lets people defer forever; a conversation asks them to choose now. The pull is strongest in the few days before the event, when it feels imminent instead of abstract. The data backs it up: HubSpot's sales research puts cold-call-to-appointment conversion at roughly 6% to 10%, well above the reply rate a cold email earns, and calls to warm, opted-in contacts do better still.

Who AI should call, and who your reps should

This is where most AI SDR pitches overpromise. They imply an AI will autonomously cold-call your whole list and fill the room. US law does not allow that. The TCPA restricts AI and other automated calls to people who are warm or have given prior consent, so an AI Call Agent is not a cold-outbound channel. The good news for event promotion is that your best registrants are already warm. Think in two lanes.

• AI runs the warm, opted-in lane. Past attendees, current customers, trial users and contacts who opted in to hear from you can take AI-disclosed calls at scale. The AI Call Agent introduces the session, answers questions, handles the usual "I'm busy" or "send me the details" and shares the registration link, all in a real conversation rather than a read-aloud script.
• Your reps own the cold, high-value lane. For target accounts you have not earned permission to auto-dial, AvairAI builds the targeting and writes the personalized call script, then hands each one to a rep as a ready-to-run task. The rep makes the human call. That is Pair Selling: AI does the grind, your salespeople do the relationship.

Picture a 15-person B2B SaaS team promoting a webinar. They have 800 past attendees and trial users who opted in, plus a wishlist of 50 named target accounts. The AI Call Agent works the 800 warm contacts with disclosed, on-message calls; the two reps split the 50 accounts and dial those personally. Nobody on the team burns a day on the phone, and every high-value account still hears a human voice. Splitting the work between AI and people is its own discipline, covered in our guide to hybrid phone prospecting.

The order of touches that fills seats

No single channel fills a room. RAIN Group's prospecting research found it takes an average of eight touches to land a first meeting with a new prospect, so one invite email was never going to be enough. The strongest event campaigns layer touches so each one reinforces the last:

1. An email goes out first to introduce the session and its value, carrying the registration link.
2. A call follows, AI for the warm list and a rep for key accounts, turning passive readers into people who say yes on the spot.
3. A reminder call reaches non-responders three to five days out, when the event finally feels real.
4. A final nudge the day before lifts the show-up rate, not just the sign-up count.

Each channel does a job the others cannot. The email carries the link people need. The call creates the moment of commitment. The reminder makes sure an interested prospect does not simply forget. Run together across email, calls and LinkedIn, it is the difference between a half-empty webinar and a full one.

Targeting: who deserves an invitation call

Not every contact warrants a call. Spend your calling effort where it converts, and you protect your numbers and your compliance at the same time.

Start with past attendees. They already know your content earns their time, they are warm under the TCPA, and they convert at much higher rates than a cold name. Next come engaged contacts who have not bought yet, the people who have opened your emails, visited the site or downloaded something. An event is a low-pressure reason to reconnect without a sales pitch. After that, look at accounts showing recent activity, the ones whose timing has suddenly turned. Cold, industry-only lists come last, and they belong to your reps, not the AI Call Agent, unless those contacts have opted in.

If your webinar solves a specific vertical problem, let the topic pick the list. A session on prospecting for healthcare teams should go to healthcare contacts, not your whole database.

Writing a script that earns a yes

The script decides whether the call works, and the good ones share a few habits.

Lead with the value, not the logistics. "I'm calling to invite you to our webinar on March 15th" invites a polite no. "I wanted to make sure you saw the session we're running on the pipeline problem every sales leader is fighting right now" invites a conversation. There is a whole method to this in our value-based prospecting framework.

Give people a reason to act now without leaning on pressure: limited seats, an exclusive segment, a guest worth hearing. "We held a few spots for sales leaders and I wanted you to have the chance before it fills" does the job without a hard sell. Then plan for the predictable objections, "I'm too busy," "just email me," "not interested," and arm the agent with a value-first pivot for each instead of a dead end. Close every call with one clear next step: "I can send you the link to sign up, or if you'd like, I can register you right now, which is easier?"

A good AI Call Agent does more than recite this. It adapts to what the prospect says, answers real questions about the agenda and handles objections in context, which is what separates a conversational agent from a robocall.

Keep it legal: TCPA and AI disclosure

Event calls live under the same TCPA rules as any other outreach, and those rules have teeth. Before a single call goes out, you need to know each number's status. B2B has more room than consumer calling, but mobile numbers and the national Do Not Call registry still apply, event or not.

This is where the warm-versus-cold split stops being a best practice and becomes the law. AvairAI's built-in compliance system classifies every contact before calling begins: CAN_CALL_AI for numbers the AI may dial, CAN_CALL_MANUAL for numbers that need a human and CANNOT_CALL for numbers that are off-limits. The classification, not a hunch, decides who lands in the AI lane and who goes to a rep.

When the AI does call, it says so. Disclosing that the call is automated is required, and it tends to help: plenty of prospects are curious about the technology and lean in once they know. AvairAI builds the required disclosure into every AI script, so it is one less thing for your team to remember.

Measuring what matters

Four numbers tell you whether the program is working. Track your connection rate, the share of calls that reach a live person; your registration rate per connected call; your cost per registration against your other channels; and the show-up rate of people who registered on a call. That last one is the quiet winner, because someone who said yes in a live conversation is far more likely to actually attend than a name that clicked a link and moved on. Clean data matters here too, since stale numbers drag down both connect rates and attendance.

Treat your first campaign as a baseline, not a verdict. Pull the recordings and transcripts and look for what worked: the objection responses that kept people talking, the value angles that earned the most yeses and the call windows that connected best. Feed those back into the script and the targeting. The reason to run this on software is simple: the second campaign should beat the first, and the third should beat the second.

Fill the room without building a call center

Event promotion turned impersonal right when buyers stopped tolerating impersonal. The answer is not more email; it is the personal invitation that used to be reserved for your biggest accounts, now offered to everyone worth inviting. AI cold calling, done the legal way, makes that possible: the AI works your warm, opted-in list while your reps put a human voice on the accounts that matter most.

That is the Pair Selling model in a single campaign. The machine handles the volume and the compliance; your salespeople do the part only people can do. You fill more seats, you stay on the right side of the TCPA, and your reps spend their hours on the conversations that turn attendees into pipeline.

Want to see it run? See how AvairAI works: from your website to a live campaign in 10 minutes. Start a 14-day free trial, no credit card required.