Truth be known, politicians will make the decisions. Public health officials will (as always is the case) make recommendations.
I do agree that crowd based gatherings will be the last things to resume, and further agree that universities will be amongst the last to re-convene, because they are by nature the most cautious and "woke". (That means both a good thing and a bad thing, imho.)
Nevertheless, there is a lot of revenue at stake for these folks, and there will also be a ton of pressure, since most of the rest of society will be re-opened by then and the pro sports WILL be as well...whether or not in front of live crowds remains uncertain.
I suspect that some of the "experts" will lose credibility as it becomes increasingly obvious that their estimates in this first wave were badly overblown. A field hospital went up in Seattle, saw absolutely zero patients, and is now being dismantled. The estimates that Cuomo screamed about in NY turned out to be drastically over-stated. (Trump was right, he did NOT need 30,000 ventilators.) The damage to the economy will be something that will become a bigger issue as we turn the tide on this disease.
The nature of this disease makes it extremely likely there will be another wave in the Fall. The nature of our medical professionals make it extremely likely we will have treatment protocols that render it far less deadly by then. Vaccines won't be available until next year, but if it drops down to mortality levels below that of the seasonal flu (entirely believable if the treatment protocols improve as hoped), then it will hard to maintain this level of social disruption when we haven't done it in the past for the flu.