Seb's Han would have gone. Probably somewhere more towards the end of the actual event (like 5pm-ish, fashionably late) and he would have spent most of his time in a vague orbit around Luke's general vicinity. Not obviously following him, but he would be usually able to be found near him.
Simon liked Star Wars enough as a kid that he was curious about the mention of a Jedi temple. He would mostly go and wander around curiously.