We have another winter-related useful phrase for you guys: to break the ice.
When you're in an event where everyone doesn't know anybody,
it is very hard to relax and start talking to people.
"Breaking the ice" is used to describe an action to help people relax and start talking.
It can also be used to talk about someone who did something first.
In my first day of class in university, my professor asked us to introduce ourselves with a funny story to break the ice.
A: I need your help for my birthday party.
B: How can I help?
A: I invited people who don't know each other, so I need to think of a game to break the ice.
B: How about a matching game? It's a good way for people to talk in smaller groups.