Am I Doing This for Nothing?

We have a birthday party scheduled for later this evening at a local pizza place.
The problem: It is snowing.
Actually, the real problem: It is snowing in Oklahoma.

We are under a winter weather advisory as it is supposed to snow into the late afternoon/evening time. The snow is really wet, and I don't think the roads are bad. I'll get a real report from Rob when he comes home from work.

The reason for the post: I am currently working on icing the birthday cake for the party tonight and wondering if I am wasting my time. Sometimes even a little bit of snow is enough to throw the locals around here in a tailspin.

The current dilemna: Do we have the party and hope that at least some people come and no one gets hurts driving (they really don't know how to drive in the snow around here) -OR- postpone for another time? And, of course, what I am going to do with all this cake?!