Well, I am giving four days notice. Dano festival starts on May 24th and run to the 31st.
This is Gangneung's biggest event. Gangneung City Hall ran a tour for local foreigners last year and here are my posts (1, 2, 3). City Hall actually ran two tours for foreigners, one for those living locally and one for those living further away. The former tour was good and I learned a lot about the culture and history behind the event - and had a good time. A coworker who didn't live in Gangneung last year took the latter tour and found it poorly organized and was unhappy with the whole thing.