If we can quantify this, would be happy to bet with Nate at longbets.org with the proceeds going to charity.
Second, governments would need to allow them.
Third, the relevant businesses would need to stay solvent (or arise again in a profitable way).
Fifth, internet-based alternatives would need to be abandoned in the rebound. But (eg) Zoom seems to be catalyzing persistent changes.
In general, I think people are underestimating the duration of the pandemic & the challenges associated with scaling a vaccine.
See also:
theatlantic.com/ideas/archive/…
If this happens, it's an ongoing disincentive to avoid crowds.
theatlantic.com/health/archive…
Physical events are more expensive than digital events, both for organizers & attendees, especially post-COVID. So many may choose digital alternatives.