Surprise Birthday in MD/NoVa

[pradarose]

A group of friends and I want to plan a surprise birthday tomorrow (Friday night, probably after 9) at an affordable, decent restaurant with a good dessert selection. The birthday girl likes chocolate, gelato, and any sort of ice cream cake.

There'd be around half a dozen people.

In terms of location, anywhere within easy driving distance from College Park/Silver Spring would work -- so Tysons/NoVA, Rockville/270, Montgomery County, etc.

I'd rather not go any further North than possibly Columbia (some people will becoming from Gaithersburg).

Thanks in advance for any suggestions!