Folks getting 500 errors etc.: I'll try to move to beefier server(s) tomorrow (now sleep time here...). Expected like max 100 people on day1, whereas right now it's over 600.
Not the worst problem to have! :) But bear with me/us if this crumbles under load a bit.
@Sulli since I know nothing about hosting or internets, I picked masto.host based on someone's reccomendation. But I picked way too underpowered tier, so now moving into a more capable one.