If you would like to challenge a member of the Notorious Racing Elites, go to the members page and click on that member's name. This will bring you to their profile on Xbox.com. Just send them a message with the date and any other information they might need.

If you just want to challenge the NR Elites in general, or would like to race team vs team, send a message to xXShadowStrikeX over Xbox Live with the date, how many members can race that day, and any other information needed.