An agent joins an event/group with participants/friends at a location.<p>Related actions:</p><ul><li><a href="http://schema.org/RegisterAction">RegisterAction</a>: Unlike RegisterAction, JoinAction refers to joining a group/team of people.</li><li><a href="http://schema.org/SubscribeAction">SubscribeAction</a>: Unlike SubscribeAction, JoinAction does not imply that you'll be receiving updates.</li><li><a href="http://schema.org/FollowAction">FollowAction</a>: Unlike FollowAction, JoinAction does not imply that you'll be polling for updates</li></ul>.