AR events are best described as virtual events held online using Augmented Reality as the main technology. A great example of a pure-bred Augmented Reality event is the Pot Noodle Virtual Careers Fair.
Popular Instant Noodle brand Pot Noodle utilized Web-based Augmented Reality to host their virtual careers fair event for students to access via their mobile device or desktop pc.
Students accessed the experience via a URL to activate a selection of 3D career expo booths that appeared in-front of them in WebAR.
AR can also be used as an additive technology to both virtual and physical events. As in this example from the Samsung virtual event, Samsung used AR to show off their latest product releases in 3D.