I wasn't planning to go this year (full disclosure: I have never gone to GABF) so this conversation isn't really relevant but IMHO I don't know that we will ever be "back to normal". I think we will have to accept a New Normal. This will change people around the world. The flu in 1918 changed society too.
That said, I don't think big public events will be a thing by September. Too much risk and remember, people will need pay off their toilet paper bills yet.
I'm assuming college may be back in session but football won't be. I only care because my youngest is in the Iowa State Univ. marching band. Four out of 4 in college bands!!! I feel bad for her. Her older sister is graduating from ISU this Spring but likely will never get to walk across the stage. This will change all of us.
And in 20 years the country will be run by children who were home schooled to day drinkers. That should be fun.
Paul