That's So Raven - Season 2 Episode 21 -

Raven and Chelsea get waitress jobs at The Chill Grill to raise money to go on a ski trip. They chat with customers, and ignore their duties, so Victor fires them. They persuade him to give them another chance, and try to plan a big party for the restaurant that night. Unfortunately, they both plan a separate party, along with one already booked, leading to three bashes on the same night.