Sorry for not answering your question earlier on today, I only now noticed it.
Lol about the size of the plush toys, I totally understand you there, as we wanted to buy our favorites the biggest & baddest ones! *wink*
Seriously, the seats in the coliseum are unusually small, nothing like theater/airplane/train/automobile/office chair seats, so I give you fair warning, as your one big bag must be able to fit underneath your seat, thus I would say any stuffed toy over 24" is a bit too much, but you could try, also such a toy would only allow you to throw one onto the ice. However, like us, if you have several favorites, you might want to take this into consideration. *smile*
My plush toy was bought at Seattle's oldest toy store in downtown Seattle, the best, and I took it as a good sign that they only had one elephant (which Evgeni likes), so I purchased this FAB unusual elephant & then got him a customized shirt to wear over at the mall, so the elephant's shirt has both Evgeni & my name on it, as well as a heart, and a beautiful card I attached with it, thanking Evgeni for all the pleasure he has given me over the years. Also, I bought him a heartfelt gift from the exclusive jeweler I use for all gifts to loved ones, family, friends, et al. I had it perfectly wrapped to withstand the throw, lol. In hindsight, I realize I now have the third eye.
Good luck with your arm throwing, lol! Seriously, you will have a blast, a once-in-a-lifetime experience you will never ever forget!
ps: I honestly don't think it's a good idea to get autographs at the Olympic during the competition, in fact I saw no one even trying, but I would say after the competition is over would be a great time, as well as catching the skaters walking downtown, et al.

Btw, cool fact: Vancouver's gorgeous huge amusement park - PlayLand - is located right next door to the coliseum, literally, a stone's throw away. FABULOUS!!!!!!!!!!!!