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You're holding a dinner party and can invite three famous people from the past or present; who would they be?

I never understood the appeal of this. I hardly get to see my friends and family. I would rather invite them to dinner than a group of people I don't know. That just sounds exhausting.
You have the opportunity to question someone about something you've always wanted to know and receive a truthful answer; what would your question be?

No no no. In my experience, if someone is holding back on telling you a truth, it's because it is not going to make you feel happy. I'll pass.
If you could change one thing in your life, what would it be?

My workload. See answer to Q1.
If you could save other people's lives by completing an act that would lead to your own death, would you do it?

As ever, answers depend on the context. If we are talking about an overstuffed inflatable raft full of vulnerable children floundering in the English Channel, then unequivocally yes. If we are talking about an autocratic dictator and his henchmen, then absolutely not.
Would you commit murder if you knew that you could get away with it?

No.