What's a good wedding gift when you attend your own parent's next wedding?

Do they a wedding registry? If so, I would buy one of the more expensive things on the registry.

Or maybe a weekend stay at some spa nearby? It’s hard to give you suggestions when we know nothing about your parents or their wedding plans/theme and post wedding plans.

to each other?

Show up.

I disagree with PnL that it must necessarily be an expensive gift. Obviously, it is not a first marriage.

If for some reason, you and siblings are delighted and want to go all out on a gift, get together and get a digital camera for the honeymoon and accompanying toys.

If you are on you own, what about one of the new digital frames for their wedding or honeymoon photos along with a certificate for tech support (handmade from you) if they are likely to need it.

I bought my mom a really nice picture package and frams for building the start of her new family pictures. I think I did the same thing for my dad actually. They got remarried to other people. I don’t know if that is your situation.

A nice bottle of good (not too dry) champagne, and an engraved bucket.