Show HN: WhenNOT – scheduling longer team events by asking when not

I had problems scheduling company get together. 3 days in next 3 months, 12 people, whats the best date for that? I've build the solution to my problem (human coded haha) and recently is started getting traction which is nice, so we added Slack integration (Claude coded).

WhenNOT flips the question: instead of "when are you available?", we ask "when are you NOT available?"

It's completely free - no premium tiers, no limits. I built it because I needed it for my own team.