I run dozens of events a year. Online and even now in-person. I don't have any "space" issues with virtual events. Which platform that you're using has registered attendee limits (vs. actual live attendee limits) and how does a no-show at a virtual event take away space from someone who is going?

All the streaming / event platforms I use charge based on actual viewers and attendees or active users on the platform. If I had a limit of 100 live, I could literally have 1000 people registered with 900 no-shows and that wouldn't be any issue. The no-shows are not taking anything away from the shows.

The only reason to manage no-shows is to manage active engagement. And that's more of a community building thing than a platform thing.

Virtually, from what I can tell, is managing Zoom events, which are entirely online events, so live in-person attendee limits don't seem to be a factor here.