Is this a good idea for a sweet sixteen party?

i was thinking about going to a park and setting a projector up so me and my friends could watch a movie on like a white tablecloth/bed sheet. and then also asking Polite in Public (here's the website - politeinpublic.com) to come and take pictures. Yay or nay on the idea? and if its not, what are some good ideas? Thank you:)