When you are at a party or an event you are going to tun into people who may not want to be there. You will recognise them, they are standing by themselves, next to the wall, not talking to anyone.
They are called:
Say hi to them. Start up a conversation. They will be very happy that you took the effort to break the ice and even though they might not look like the life of the party (because they are not) you might find that they are super-intelligent and quite fun to be around.
Next time you are at a party engage with the wallflower. You will make their day and you will find a friend for life. I can almost guarantee it.