Asking a Skateboarder to Sadies Dance

My sister called her boyfriend down to the office and hid behind the principal's desk. When he came down, she popped up with a sign that said "Will you go to preference (same as sadies) with me"

get him a blank deck and write says "will you go to _______ with me"

I certainly would NOT mention being called to the deans offic. Maybe you could draw a skateboard, write the invitation on it in Spanish, cut up the picture to make a puzzle, Put in envelope and give to him.
Hope he will be able to go with you.