I wish I could be there as well, looks awesome!
nostr:npub167n5w6cj2wseqtmk26zllc7n28uv9c4vw28k2kht206vnghe5a7stgzu3r dev hack day seems really fun
So sad I cannot be there 🥲 
Discussion
where r u based ?
Switzerland. It's a short flight away but I really don't have the budget neither the time to go at these dates.
I will attend the Swiss event "Le Paradigme Bitcoin" end of June, it's smaller but I can go there as day trip and price for conferences is much more reasonnable, like 160ksats.
Sounds cool! The whole EU seems have many btc conf in the next half year