My daughter is turning 8 next week (which kind of blows my mind!) and she's been wanting a sleepover since she turned 4. Yep. Four. It only took her another 4 years to get me on board with her plan!  I decided to turn it into an art party/sleepover to give the girls a little structure through the evening since this party started a few hours after a full day of Saturday school (such wonderful…