I heard from a colleague who recently attended a customer event at an aesthetic practice. The event was sponsored by Allergan and primarily promoted Latisse to their event attendees.
The physician was offering a discount on Latisse to any attendee who purchased that evening or within a few days.
I thought it was interesting that the physician did not promote her other services or products. She sold ~10 units of Latisse at the event and of course, there will be a great opportunity to market additional services to those buyers going forward but I think it would have been a more profitable event had the physician enlisted additional vendors for support and opened up her event to more promotion. She could have promoted laser hair removal (which can be safely performed year-round with CoolGlide Nd:YAG, even on tanned patients), non-invasive skin rejuvation (Laser Genesis, again, safe on all skin types, year-round), Titan, fillers and BOTOX.
Open houses and customer events are a great way to have current customers (patients) bring friends and family, enjoy some wine and hors d'oeuvres while learning about new products and services and enjoying special attention (receiving goodie bags, being offered special discounts for packages paid for that evening or within 48 hours, referral $ or points if their friends/family buy product or sign up for packages). 
Customer events are great marketing tools - just be sure to leverage the event for all it is worth!
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