You are going to a party with a friend. leave a note at his/her house. say: where the party is. what time you will. where you will meet. use the notes on this page as a model.

Hi Ann,
I've got an invitation on the party and I really would be glad if you came around. We will have a lot of fun! If you are interested, go to the restaraunt Golden Lion. Party starts at 20 and don't forget about dresscode (official style). A good friend of mine arranges it and he allowed me to invite someone. It is going to be legendary!
I will be waiting for you there!