If you are the event host:
Start by ignoring the offending avatar. Just select the "Ignore" option from your People menu. If you do not have an event scheduled in your House or FunZone, the offender will be teleported out of the place within a few seconds. If you do have an event in progress, you will have to remove the offender yourself. Select "Info" from the ThisPlace menu, select the People tab, find the avatar name of the person you want to remove, and select "Remove". The person will be removed from your event, and will not be allowed back in for the remainder of your rental agreement. The offender will also receive a warning notice, explaining that they were evicted. As long as you continue to ignore the offender, he or she will not be able to find you in There unless you go into your People menu and select "stop ignoring".

If you are a guest at an event:
Start by ignoring the offending avatar. Just select the "Ignore" option from your People menu. If you would like the offender to be removed from the event, contact your Event Host via IM. Please start a new IM window; do not use the House or FunZone IM, as the other event attendees will be able to view your comments. Further action will then be up to the Event Host's discretion. If you feel the matter requires our attention, you may file a complaint about that person's behavior at help@there.com.