Wedding present wisdom required, please!

[BamboofordinnerAgain]

We’ve been invited to the evening do only, never been to one before. Bride is daughter of close friends, but haven’t really see her much for a good few years. The invitation had a John Lewis gift list card enclosed, which is fair enough. They already have a house full of stuff, but hey...
My question is, for an evening do, would you buy the same kind of present as you would if you were invited for the whole day? There’s no food provided, and it’s a cash bar. I’d normally spend around 100 quid on a present, but feel a bit less inclined as it’s only the evening do.
What’s the wisdom here, wise women? Am I just being cheap?

Just buy whatever you can afford and what you think they'd like.

A card with £20 John Lewis gift card would probably be a nice gesture.

Normally evening guests just give a card and maybe a small token gesture gift (in my experience anyway).

Blimey I would just take a card and a bottle of fizz! No food, no free drink (tho the drink is fair enough tbh)? What are you going for then?

I went to my first evening do recently and while I had a really good time chatting and drinking with a close group of mates, the event was a real afterthought. Bit like arriving at a party at 10.30pm and everyone's drunk already. Certainly wouldn't buy a big gift op.

The gift should be commensurate with your affection for the recipient rather than the value of the entertainment. As it's someone you rarely see, £20 - £30 sounds fine.

I’m glad I asked, thanks for your replies. I guess the fact that there was a gift list card in the invitation made me think it was a thing that the evening guests coughed up for a present. My DH reckons we are only invited because older people are more likely to spaff money on a decent gift! My DD and her mates seem to get away with not buying anything, but they are at the age of going to six weddings a year. It’s a minefield...

Evening do I'd probably spend £30-40. If they have been considerate with the gift list they should have gifts for all budgets.