I have to go to a get together, but I'm not going to start any conversations there.
Seriously? Why don't you want to start conversations?
I don't want to talk when people just ask me stupid questions.
It is kind of rude to ignore people.  Not everyone asks stupid questions, by the way.
I'm just going to ask people to not talk to me since I don't want to talk to them.
You might consider brushing up on some small talk before the get together. People will think you're being rude, and it will make them uncomfortable to be around you. You actually might enjoy the conversations once you get into them.