Earlier this week we told you about the change that Playfish is making to Restaurant City: you will soon be able to cook for 24 hours straight. Now the official fan page has set up a Facebook event for the launch of 24 hour cooking. The event starts on the 2nd of June and ends the 9th. It is unclear if the change will occur at the beginning or end of the event, but there is another reason to RSVP: if 150,000 players RSVP, you will receive a special T-Shirt to share with your friends. There are currently over 60,000 signed up to attend, so RSVP soon! You can RSVP to the event here.