Well since ROBLOX is not actually real life... The way Health Checks work here is that a Health Check is when an event organizer decides wither to hold or not hold an account security precaution test. This will be held through making event attendees of a certain event join the event venue's ROBLOX group in order to join the event. This is to keep safety a priority and to prevent the chances of an exploitation occurring. If an event does not have a Health Check icon, this means that their event did/will NOT require a Health Check. If an event does have this icon, all event attendees are required to follow this check or else they will not be able to attend the certain event.