A TV Guide style web app built on Nostr that allows services to publish as a feed their planned events.
A user of the Guide would be able to subscribe to any number of a bunch of available public feeds, such as upcoming NostrNests, upcoming Zap.Stream s, Bitcoin meetups, contests on Stacker.News etc.
Subscribing to a feed plops all the events into your Guide/calendar. Perhaps a feed could have options, such as subscribing to live events, but not to replays.
Then the Guide user has search and reminder options, forwarding to email, push notifications.
There's probably a way to make this more decentralized, technically robust, principally sound, there might already be a nip, etc. but that's how I'm thinking of it.
This time I'll need a bit more visuals, force yourself to concretize and structure the idea... MVP and PoW ;)