I applied and got into a Defi Hackathon last year during SF blockchain week. My project was a Light Switch (LIFX bulb) using crypto.
So I went there, got this free Ledger Nano, and spent all night trying to do this one programming thing.
It was a good experience!
I also got lots of free 'DeFi' themed stickers including XRP, Coda, Matic, Terra, and even a nice black Oasis Labs T-shirt :D