For all zaps you can check zaplife.lol but especially for your receiving zaps I don’t know if there is already something available 😊

As in, a large display showing incoming zaps? Shouldn't be too hard.

I know nothing about these things but.... can you you zapsteam, or nostr as you want? Just tell your audience to do so and then just run an animation, or something, to make it appear it is what you want it to be. Not sure how you work this into a keynote, goodluck