I had wanted to have a sleepover. I had it all planned. 2 of my friends were sleeping over. I bought EVERYTHING we needed. I made a to do list, and cleaned the WHOLE house... then they said they "couldnt come". Now I am REALLY dissapointed. What should I do?

Get over it. There is nothing else that you can do. Reschedule it, and hope that they come next time!