I don't really have any evidence for this, but one possible thought process behind discouraging larger gatherings among vaccinated people is that (some) unvacci

I don't really have any evidence for this, but one possible thought process behind discouraging larger gatherings among vaccinated people is that (some) unvaccinated people would be likely to join in on those gatherings if they become renormalized too early. It's inevitable that large gatherings will be renormalized soon enough and that a lot of people who decline to get vaccinated will join them, but I can imagine many people would see telling a noble lie (of omission) to defer that inevitability for as long as possible as the right call.