Hi Adriana,
You can see lists of
Moscow and
St. Petersburg salsa discos here. They can be changed a little bit in July, so check them before your trip for more actual information. Unfortunately these lists are in Russian only; but just use Google Translate — it works pretty well.
My choice for New York salsa in these two cities is the following
- Moscow
- Crazy Milk @ Mondays (20:00—00:30, Bolshaya Polianka Street, 54)
- Tunnel @ Wednesdays (20:30—00:00, Lubiansky Drive, 7)
- St. Petersburg
- Club 36 @ Mondays (20:30—23:30. Griboyedov Canal, 36)