... Methodically kill all the ones that made their way in and then spend rest of afternoon and evening in the tent:
HOLY COW never seen it that bad... is that just from quickly opening/closing your door to get you/gear in out?
Also, did you happen to notice if mosquitos, once inside your tent, started shift their focus away from biting you and more toward just getting out? (eg, just hanging out at the peak and against the walls like that).