i don't want to insert myself into this conversation, bu i think it is incredibly irresponsible to have the bash given current circumstances. The fed just said to limit groups to less than 10 people.
Plus, this sort of gathering is really the riskiest right now... having a bunch of people from a variety of areas get together and then go back to their individual communities. If just 1 person at the bash is sick, it could end up spreading it to a number of communities.
Please don't do this bash and reschedule for a few months from now.