I'd opt for ONE: the toxic friend. Yes, you can't stand them, but you don't have to stick to them all night -- you can flit about and catch up with them, briefly. It gives you an opportunity to present a more resilient, more boundary-aware you, keep everything light and upbeat, and it gives you a way in to a party.

going to a bar or a band on your own seems a bit lame, you'll get hit on lots, and you'll stand around all night watching everyone have fun with friends and mourning the fact you don't have any.

jus' my opinion...