The dance school Salsa Y Dulzura in Renens is having a salsa party with both Cuban and Portorican music. The space is big with a wooden floor and good DJs. Entrance is CHF 10 and includes one alcoholic drink.
Event details: http://salsaydulzura.ch/soireesystages.html

The place is accessible by bus 17, Renens-Village stop. Or I have 3 spaces in my car. The party goes till 4am, and I will be driving people back to Lausanne about 2am. For those getting a ride with me, we'll meet for a quick drink at 9:30pm before heading over to Renens at 10:30pm.
Meeting point: Café St. Pierre, Pl. Benjamin Constant 1, 1003 Lausanne.

In your RSVP message please let me know whether you will need a ride or will meet us at the party directly.