This is inherently hard to give advice on so I can see your situation.
How should a (possibly) socially stilted person interact with a number of other highly variably socially stilted people?
Uhhh... Smile a lot, and try to look safe?
Say something controversial/wrong and sit back while everybody chatters about what's "actually right"?
Look up just one train then reference it in conversation and get the year make or engine wrong?
(don't learn all the functions, just find one to be wrong about and say it early)
Do the same thing with a telegraph pole, a car, a dinosaur, a computer, and a physics topic?
That should be enough to have people chatting away at you all evening.
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(14.01.b) cogito ergo sum confusus