Each week, Sephora hosts store events around the globe that can be attended by all customers — even those who aren't members of the Beauty Insider Program. For example, mini makeovers are frequently offered, as well as events hosted by individual brands.
Beauty Insider events, however, are typically exclusive to a single membership tier. To attend, Beauty Insiders, VIBs, and Rouge members must register before attending.
And once a member-exclusive event is booked to capacity, Sephora creates a waitlist for those hoping to join.
Source : https://www.thisisinsider.com/how-to-get-sephora-perks-2019-3