I know this is illegal, but what are the possible charges for this?

A couple weeks ago I pulled a prank on a friend and invited him to a dinner party pretending to be from the Rensselaer Polytechnic Institute as Harold Carlsson, the "Director of Operations". Is this legal? If not, what are the consequences? Also, the college listed above was the college he applied to, and he didn't know I was pranking because I did it through email and copied the school's logo and motto, along with a link on the email to their website and directions to the dinner party. The email was sent to 19 other email addresses, all fake, to make it realistic. I said it was a "Young scholar's dinner" for the top 20 "academically gifted" students. I'm most definitely not lying, because it happened. I'm only asking to see what the penalties are, but eventually my friend did find out it was me and contacted the college unknowingly before that knowledge, which resulted in an FBI investigation, ending when they found out I was just a freshmen in high school. From what I heard I was facing federal felonies, but they were dropped, and I ended up getting suspended from school for a few days, and from indoor track. By the way, in case nobody else figured it out, this is the email address I used to pull the prank. If it's legal, I think I may post the email I sent as proof. I'll find that one out.