What a glorious day for the Cambridge River Festival. As outdoor festivals go, this was a good one — not too big to be unmanageable, great music that you can dance to, and by the river. I caught a few of the bands — Obbini Tumbao, Maya Azucena and Forro In the Dark — all of which had a world music or jazz flair to them. They were all good but Obbini Tumbao was easily the favorite with their lively set that had the crowd begging for more.