Tiger, as you can see from the below pic the dinner last order time isn't posted, but I believe it's 7:30. There's also an implied suggestion as to certain Moosefare that you might find tasty . . .
As to the marmot problem at Trail Camp, I would suggest you bypass the issue and camp at Consultation Lake. It's much quieter and provides a completely different perspective even though it's just a few hundred yards short of TC. There's no guarantee that a stray marmot won't get into your stuff while you're summitting, but they mostly congregate for the Trail Camp Smorgasbord. My hiking partner and I left our tents up and zipped tight at CL while summitting a couple of weeks ago, and upon returning there was no evidence of any activity.
You damn sure don't want to haul full packs all the way to the summit! If you camp at TC, some leave tents up and unzipped, while others drop their tents with gear inside and place rocks on top to discourage marmots. Frankly, I don't think marmots can be discouraged.