Can I start group lessons any day of the week?

In the Pas de la Casa, Grau Roig, Encamp and Canillo sectors, the three-day, four-day and five-day courses start on Monday, while the two-day courses start on Saturday. In the Soldeu and El Tarter sectors, the three-day, four-day and five-day courses start on Monday and Saturday, while the two-day courses only start on Saturday. 
It is not possible to start on another day of the week, except for special departures on 27 December (for 3, 4 or 5 day) and 2 January (for 3 or 4  day).