ideas for a 20th birthday slumber party is for my girlfriend?

Answer 1

I don't think 20 year old women have slumber parties.

Answer 2

Ask people to set up their sleeping bags as soon as they get to your house
Play outdoor games or organize a scavenger hunt around your neighborhood before dinner.
*Rent a movie and make lots of popcorn beforehand
Set out a few board games so the ones who don't fall asleep right away can quietly keep themselves busy.
*Get something special for breakfast or easy.
Donuts, bagels & cream cheese, fruit with whip cream and dip, individual juicesLet's Make a Deal:
You will need three boxes. Prizes of varying quality-really cool, ok and a booby prize. Each child has a chance to play so make sure you have enough "really cool" prizes to go around. Place one prize of each type under the boxes without anyone seeing. The contestant chooses a box and the prize is revealed. The contestant can then keep that prize or be given the choice to choose another. Offer incentives, like other prizes-candy, money etc. to see if they will keep the first chosen. They may keep either the first prize and incentives or choose the other box. This is their final choice.
Mummy:
Need rolls of toilet paper, one per person. You can form teams to see who is the fastest dressing their mummy (other person) or just let them have fun. This can be very messy with the dust from the toilet paper and the paper fight afterwards.
Picky Marshmallow Relay:
Need toothpicks, one per child and one marshmallow per team. The marshmallow is placed on the end of the first persons toothpick. They hold the toothpick in their mouth and try to pass it to the next person in line using only the toothpicks in their mouths

Take the girls to a late night Nail Shop for a basic Manicure or Pedicure