1. Open a music player. 2. Go to 'all music'/'library'. 3. Hit shuffle/repeat/randomise. 4. Find photos of the first 10 artists/bands that come up [no repeats and no cheating]. 5. Have people guess who the artists/bands are.
If you ignore the fact that standing for 10 hours in ridiculous hot and sweaty weather sucks, just as much as festivals and outdoor concerts do in general, you could say I had a pretty good time, which I did. But also, NEVER AGAIN.