Well, there should be cosplayers in Uppsala... it's a pretty big city afterall...
is held there every year and it's Sweden's biggest con. So if you want to meet cosplayers (and get new friends) I'll highly recommend you going there. It's held 15-17 June next year and the tickets cost 650 kr.. yes, that's kinda expensive. I'm going there for sure, all the way from Finland.
Next year will be my third Uppcon.