You need to list your location...and just what do you mean 'vendor license'...do you mean sales permit from the local/state government, or a permit to do business within a certain city/area or do you mean a permit to be a vendor at a sponsored event..
I am in CA and I have never heard of any one day permit from any gov't agency except for special events like parades, car shows etc. and that was just to be there...you still needed a business license and sales tax permit