I would say Mama Lucia's Italian restaurant.
They have "Family" style eating, so ordering ahead for a large group is probably easy.
Just one thought, though, for a meal, when I was a HS teacher and took my students to a college campus, I always ate on campus in a dining hall.
Are they playing at Cheel Arena at Clarkson? I'm sure you can call the school's dining facility. Most dining halls are pay one price and there's a buffet/stations, kids can pick what they want to eat. I went to the Crane School of Music at Potsdam, and there's Lehman Hall on that campus. They do a really nice job there. I'm sure SUNY-P would accomodate a HS group in town for a tournament (They see it as an opportunity to have kids on campus, checking out the school - you get an easy to do meal in a setting that can accomodate large groups). The SUNY-P dining services is called PACES (pronounced, pay-sees). They consistently rate among the top dining services in all of the SUNY system. I honed some culinary skills there as a student - the staff is fantastic. Today, I'm the foodie and house chef at my home. My interest in cooking started before college, but I got more passionate while a student earning work-life money through PACES. They were always concerned with putting out a quality product, and they consistently changed with the times - not like some other SUNY schools I visited where the food was not so good!
When I was a music teacher, I would take students to concerts, plays and we'd perform at music festivals at local colleges. When I took my HS students to the on-campus dining hall, they really enjoyed eating amongst the college students. It was a brief glimpse of college life for them. They loved it.
While typing this, I found a link
: They have a group rate of $10.50plus tax for dinner at Lehman Hall.
Otherwise, Mama Lucia's, if memory serves, has ample space...call WAY ahead for a weekend, though. There's aren't too many "fine" dining places in Potsdam, and this one is popular. I've been twice, both times they were jammed. But, what kid doesn't like italian food?!
Oh, and I just spoke with a Fraternity brother (who's visiting me this week) and I mentioned Potsdam eating for large groups, he said there's a Mongolian BBQ that is popular among students. A quick FB post on my fraternity alumni page yielded a positive reaction from more recent alums. Here's a link to their menu
I've never been, so I can't give direct evidence to its quality, but I trust these guys, for what its worth.
Have fun. Good luck to the girls! We used to go to Jr. Hockey games in Canada, up in Cornwall on occasion - maybe 3 or 4 times. Going to Canada was sooo easy back then. We'd also went to one CAN/AM youth tourney. A younger brother of a friend played in the CAN/AM tournament - and it was at St. Lawrence U...I think. We went to Cornwall because Jr. Hockey in Canada was nuts! Going to those games (not too often) and SUNY-P and Clarkson motivated me to learn to skate. I'm not good, but I do enjoy skating a couple times a year and not falling all over myself. Now that I'm in DC, I'm a big Caps fan!