TupeloChick:Unless you are coughing or sneezing on your hands or will be kissing your friends on the lips it's highly unlikely that if you are contagious, they will not catch anything. Colds and flu are spread through contact not proximity.
Uh, this is only partially true, especially if it's viral. Cold and flu viruses can live on surfaces for a long time. Someone can get sick by touching something you touched days ago after you coughed or sneezed into your hand. If you cough or sneeze or even give a big ol' exhale over the food, they can get sick.
And symptomatic is not equal to contagious. Taking meds to get rid of your symptoms does not take away viruses. It does help limit the virus' exit through mucus, saliva, etc but the viruses are still in your body and get still infect people (e.g. you lick sauce off your finger then put ice in someone's glass).
I still say go on with the show as long as you aren't feeling miserable but don't kid yourself about how contagious you are.