DC belongs to a dance school. Next weekend instead of lessons there's going to be a photoshoot to be used in promotional material for the school.
Lessons are paid by a monthly DD in a sort of package deal idea (kind of like gym membership) so basically you pay for minimum amount of lessons and if you can't make it to all the lessons that week you just lose out. Fair enough.
Thus week though all of the lessons we've paid for will be taken up by this shoot ( we can only go on a Saturday morning and use our quota up)
So, DC will not be getting normal paid for instruction and the business gets free models.
AIBU to be a bit 
that we haven't even been offered a discount this month ire additional lessons to make up for the lost lessons. To me it seems a bit presumptuous of the owners, especially since they're getting free models.