There's an option to hide online events, but not to select for them. Inputting "online event," which is how the location comes up on Barq, as the location doesn't work. Barq already categorizes these, as evidenced by the presence of an online event filter, so the functionality is there. It doesn't make sense for users to only be able to exclude. Users want to attend online events, and it's currently impossible to find them because events are forcibly ranked by attendance.