Cammie, as long as you go back to your normal routine afterward, there is no reason to worry about one dinner, especially if you stuck to reasonable sized portions. Remember that your body cares most about your overall pattern of eating and activity, not mere isolated incidents.
The occasional indulgence is actually part of my plan, and I allow myself to enjoy special outings like that with the understanding that it doesn't give me a license to continue eating that way after the event is over. When I go to a nice restaurant, I get what I want (including drinks and dessert) without worrying about the calories, though I make sure not to eat and drink to excess. It took me a long time to learn to stick to reasonable portion sizes with treat foods, but I've found it to be an incredibly important skill!
Don't worry too much about the dinner, just keep on keepin' on