There are a few popular satsangs in Rishikesh and they take place daily during fixed periods of the year, often during the friendlier weather and travel seasons. You need to check on the calendars on the satsang websites (click on the name of the satsangs below to go the websites).
Shanti Mayi Courses: Seasonal daily satsangs and bhajan/kirtan singing. The satsangs are in English.
Mooji Courses: Seasonal daily satsangs and bhajan/kirtan singing. The satsangs are in English. It's highly popular although not in the main tourist area.
Sri Prem Baba Courses: Seasonal daily satsang and bhajan/kirtan singing. The satsangs are in Portuguese with simultaneous English translation.
These satsangs usually last for 1 to 2 hours and some take place daily, others not. If you feel more like totally immersing yourself into the yoga world, joining a yoga retreat in one of the ashrams in Rishikesh will definitely intensify your experience. But be prepared to commit yourself to a few weeks of full-day daily programmes in these ashrams.
Know of other interesting satsangs in Rishikesh? Write it into the comment box below and it will be added to the list.