The people hosting a party for 40 or so are selfish and irresponsible.  The "jealous you weren't invited" comment is insulting.  My daughter is a midwife who works at a hospital here in California.  Her husband is a nurse at another hospital.  They have both seen this thing on the front lines.  Both of them assume that they will, in fact, be infected sooner or later, and I fear greatly for their well-being.  This virus is not a joke, nor something about we should be making jokes.  You can use statistics to show whatever you wish, but the bottom line is that social distancing will help; failing to do so can only hurt oneself and others.  Some people, like my daughter and son-in-law, need to be out in the public.  Hosting a party for dozens doesn't exactly qualify as "necessary" or public-minded.