DC tournament in Sofia this year
Fist because it's nearly the only one i've seen live
But also because it was in Sofia's best tennis club (the national tennis center), which is in the middle of a park, it's green and perfetc overall.
Then because you can watch any match with one pass, which costs 2.5 Eur, you can communicate with the players and umpires (had a short conversation with Pascal Maria) and there are several young talents to be seen.
Watched Berankis live there, he was coming back from injury and played half of his abilities, but still won against a Greek fellow i never heard b4, who was playing solid as well.