I came across this blog post and thought this was a great way to throw a party without having to pay for it.
Instead of an official Sweet 16, with invitations, food, and the lot, this guy sent out a text, said that he was having his Sweet 16th birthday at a certain local skating rink with the date, time, & how much it cost to get in.
This way his friends had to pay for their own admission, but the parents provided the birthday cake.
It was a night of skating, cake, and a little dancing at the end of the evening thrown in by the rink. Brilliant.