BGG.CON! BGG.CON SPRING! BGG@SEA!
Is it okay to arrive late?
What will we miss?
Typically the "puzzle hunt" is held Friday afternoon. That's about it, though. Given that the focus of the con is open gaming with few scheduled events (all of which are totally optional), arriving on Friday evening means you'll still get tons of gaming in.
No, and no. You'll be fine.
Do any additional arrangements need to be made with the con? The hotel?