Vivaldi concert in Venice

Interpreti Veneziani. Seen them three times, music great, St. Vidal church is a nice setting. You can see some of their pieces on YouTube to get a feel for them.

Here's another vote for Interpreti Veneziani. Most of them do the entire Four Seasons from memory. The performance of the cellist, who is the group's leader, is a full-body experience. Be sure to arrive before they open the doors to get a good seat. And just FYI, the church has been "deconsecrated" so it is now only a secular performance venue.

Here's a 360 degree peek inside San Vidal, with Google Maps: https://goo.gl/maps/MUrJJ49K4VH2

And here's a 360 of the piazza that church sits on: https://goo.gl/maps/XMXJQjxEHJ82

I Virtuosi Italiani do concerts at the Chiesa Pieta on the Riva near the San Zaccaria vaporetto stop. They are very good as well. The Chiesa Pieta is where Vivaldi taught music, although the actual building was built after he had moved on. One down side is that cruise ships pass by in the evening (unless they have been rerouted since I was last there). I remember a concert there where during a solo passage, a giant cruise ship sounded its horn right outside the church. The soloist just rolled his eyes and kept playing, not missing a beat.
http://www.ivirtuosiitaliani.eu/default.asp?iId=GFHGHF

Adding to what Michael said--the cellist's name is Davide Amadio. If possible, pick a date that he is playing and, again as Michael said, get there early and get a seat as close as possible, as watching Mr. Amadio play--and seeing his facial expressions--is great fun.