Popup classes are classes that are set up with little notice. In the case of Free Week, it might be one class that went especially well and the instructor wants to add another section. Or a staff member has a time clear up and wants to show something new. Or a newly certified instructor wants more chances to get in front of a class. Other classes might just have missed the deadline for the marketing materials. In Free Week it means an extra chance to win free classes and lessons. So quick, message your friends and we'll hope to see you pop up. More Info below.