Whenever you enter a new (sub-)culture, you have to learn the social norms. Some people have an easier time, others have a harder time. There’s not much advice we can give you, since every culture is different. Some value privacy, others openness and honesty. Some communicate stuff via head nods, others by how far you stand away, and others by pitching the tone of their voices.
You will learn too, but it will take lots of exposure and trying. Some people will dislike you for not understanding, others will be forgiving. How much you should make allowances and whether it makes sense to tell them that you are autistic depends on their specific culture and personalities. So, uh, good luck.
note: (sub-)culture here does not mean only the nation you’re in, but it can change group-to-group. Essentially it’s the vibe that a group has.





What are the chances that visiting Steven Hawking is the most interesting/fun thing you can do, if you could freely time travel? I’d much rather go look at dinosaurs, or visit the construction of the pyramids, or go listen to Martin Luther King Jr.'s speech.
Even if my goal was to meet a single scientist, I think I’d personally pick any other. Pliny the Elder, Marie Curie, Albert Einstein…
Not to be rude to Mr. Hawking (well, maybe he deserves it, I don’t know what got him in to the Epstein files…), but a thorougly average party is simply not likely to attract very many time travellers.