This website is utilizing several customized plugins to meet their exact needs.  It’s based on a WordPress / WooCommerce base and offers product sales to the public at retail, plus multiple wholesale pricing tiers that show and hide products and offers tiered pricing based on the customer type.  They also have a full events registration module that allows for people to register and buy tickets to events and gives full admin event management like attendee rosters, barcode tickets for entry and more.