Think about every expert event in three phases: before, during and after. Most teams pour their energy into the live hour. The best teams give the weeks either side the same care, and they start planning the next session before the first one has even happened. This is the playbook we use with the pharma, agency and consumer health teams who run sessions on Adelo, with the evidence behind each step.
One note on numbers. The benchmarks below come from webinar platforms' own data, mostly business audiences. Treat them as a yardstick rather than a target. Your best benchmark will always be your own last event.
Seven checkpoints, from six weeks out to the next session
Adelo Guides · based on the checklist in this article
Before the webinar: design the whole event
Write the one sentence everything else hangs on
Before you book a speaker, finish this sentence: By the end of this session, [a specific audience] will be able to [a specific thing]. "Community pharmacists will be able to explain the new evidence on X to customers" is a brief. "Raise awareness of X" is not. That sentence decides your speaker, your format, your length and your promotion.
Choose the webinar format that fits the goal
| Goal | Format | Why it works |
|---|---|---|
| Educate | One expert talk with plenty of time for questions | Depth and a clear line of argument |
| Explore a debate | A moderated panel of two or three experts | Real disagreement keeps people watching |
| Tell a story | An interview, where a host draws the expertise out | Feels like a conversation |
| Gather insight | A small, highly interactive session or advisory board | More voices, richer data |
How long should a webinar be?
You'll often hear that people can only concentrate for 10 to 15 minutes. Neil Bradbury traced that claim back and found the primary evidence doesn't support it.1 Industry benchmarks for 2026 put average engagement at 49 minutes in 2025.2 So a 45 to 60 minute session is fine, if it's well run. Build in a change of pace every so often, because variety is how good teachers hold a room.
What is the best day and time to host a webinar?
There is no magic day. Mid-week tends to work, but consistency matters more than the perfect slot: a regular time teaches your audience when to expect you. For clinical audiences, clinic hours and on-call patterns matter more than any benchmark, so ask five people in your audience when they could realistically join.
Prepare your experts like a broadcast
TV studios never put a guest on air without a producer, a run of show and a rehearsal. Treat your experts the same way. Brief them early, rehearse on the real platform a few days before, and send them our guide to looking good on a webinar.
Three roles, so nobody runs the room alone
Expert
Delivers the substance and answers questions.
Host or moderator
Opens and runs the conversation, groups and reads questions, and bridges if something breaks.
Producer
Runs audio, video, polls and captions, watches the lobby and keeps a private line to the speakers.
Audience questions go to the host.The producer talks to the speakers on a private back channel.
The production model Adelo uses for supported events
How many emails should you send?
Most people decide late: a 2026 benchmark report based on more than 7 million registrations found around half sign up in the final week.3 Promotion that stops two weeks out misses half the audience. Sending more emails won't fix that by itself; giving each message a single job will. This is the sequence to start from, then adjust for your audience. For clinicians, our guide to getting healthcare professionals to attend goes further.
| When | Message | Its one job |
|---|---|---|
| About 3 weeks out | Invitation 1 | The promise: what they'll be able to do afterwards |
| About 10 days out | Invitation 2, to non-openers | A new angle: the speaker, or a question they'll answer |
| 2 days out | Invitation 3 | Last call, and "you'll get the recording" |
| On sign-up | Confirmation | A calendar invite with the join link inside it |
| 7 days, 1 day, 1 hour | Three reminders | The last one is the link and nothing else |
| Within 24 hours | Follow-up 1 | Recording, slides and answers, to everyone who registered |
| Within a week | Follow-up 2 | The best clip and the date of the next session |
Make joining a one-click job
This is where webinars lose the most people without anyone noticing, and it is the complaint we hear most from clinicians. A link that asks for a download, a password, a second registration or a browser plug-in loses people at exactly the moment they've made time for you. The web already knows how unforgiving this is: Google found that 53% of mobile visits are abandoned when a page takes longer than three seconds to load.9 A webinar lobby is no different.
- Browser only, no downloads. Hospital laptops and NHS or corporate networks often block installs and plug-ins.
- One personal link. In the calendar invite and the reminders, so nobody hunts for a password at 5:59.
- Test it on a phone, on 4G, on a locked-down work laptop. Many clinicians join from exactly those.
- Put a human on the door. A producer watching the lobby and a simple help line rescue people who would otherwise give up.
- Let people rejoin in one click after a dropped connection, without registering again.
Get compliance, consent and accessibility right from day one
Tell registrants who is collecting their details and why, as the ICO's right to be informed requires under UK GDPR.4 In pharma, Clause 10 of the 2024 ABPI Code requires companies to examine planned events for compliance, so build review into week one.5 In the US, the PhRMA Code plays a similar role. And caption the session: WCAG success criterion 1.2.4 asks for captions on live audio.6
Consumer health has rules too, even without a medical affairs team. In the UK, food and supplement brands can only make health claims that are authorized on the GB register, and the ASA judges an ad by what consumers are likely to understand, including claims that are only implied.10 In the US, the FTC's 2022 Health Products Compliance Guidance says health claims need competent and reliable scientific evidence, generally randomized controlled trials, and that expert endorsers and influencers can be liable alongside the brand.11 An expert on camera saying "this helps with anxiety" is a claim. Brief them on what they can and can't say, and read the questions before they go on screen. Our compliance guide covers the detail.
During the webinar: run it like live television
- Open the room early with a holding slide, so early arrivals know they're in the right place.
- Start on time. The people who turned up on time are the ones you most want to keep.
- Lead with the promise: say your one-sentence goal out loud in the first minute.
- Do housekeeping in 30 seconds, then get straight into substance.
- Launch a quick poll early. It gets people clicking and tells your expert who's in the room.
Use polls to help people learn
Polls do more than keep people awake. Roediger and Karpicke showed that being asked to recall information beats rereading it when people are tested a week later.7 A well-placed knowledge check helps your audience remember what your expert said.
Ask, show the result, then explain it
123- 1The question stays on screen while people vote: 17 responses in 4 minutes 26 seconds.
- 2Only 18% chose to review all three targets together, the habit the session was built around. That gap is what the expert talks to next.
- 3The most popular answer, 53%, gives the expert an easy place to start.
Real Adelo screen · live poll results, as the host sees them
Make Q&A the best part of the hour
- Seed it. Have one or two strong questions ready, gathered at registration.
- Take questions throughout. Waiting until the end loses the people who had to leave early.
- Group and edit. The moderator combines similar questions and reads them out clearly.
- Agree the rules before you go live. In pharma, that includes off-label questions and possible adverse events. In consumer health, it includes anything that sounds like a diagnosis or a cure.
Give the producer a separate seat
The moderator should be the one running the conversation. A producer watches audio and video, spotlights the right speaker, launches polls on cue, watches the lobby for people who can't get in and keeps a private back channel to the experts. When something goes wrong, and it will, the host bridges with a question while the producer fixes it.
Adelo Guides
