Hun, your better off with the Mariott...
Lucky ass! I had to cram 13 into mine, also food supplies and visitors, it was busy, the only time it was quiet...was...wait, I don't recall it ever being quiet, Lmao. Just eight should gbe fine for one room, depending on your supplies and such, book for two, have people throw money in on the wages. bring your own food this way you wont have to buy food and you'll save money, at the DunDraCon this year, it was hard, but this is the Fanimecon, more hard.
Besides, the Fanimecon is at the Mariott like the Dundracon was. I wouldn't even call the place crammed, but our hotel room still had a lot of room after 15 people piled into it, garanteed I slept on the floor, the rug is pretty soft, Lmao
But anyway, stick with the Mariott, get a room as fast as possible. Hurry? Everyone is rushing to get rooms, I'd book and tell them I'd pay when I get there, as well as ask for extra keys, if you have a lot of people, example: 13 people. 3 keys.
Most of the people usually stay in groups for they feel safer, so if you are hanging out in a group with a bunch of people, only two people need the key in that group, make sure it's divided, and also make sure everyone knows who has a key to the room. Good Luck!