S.H.
food: #1 witch's hats made from fudge-stripe cookies, striped side down. Then using a dab of chocolate frosting, "glue" an unwrapped Kiss on top. & you have a witch's hat! (for Thanksgiving, substiture a Rolo & pipe yellow icing into a buckle for a Pilgrim hat)
for other ideas hit the mfg websites for Pillsbury, MM, Betty Crocker, etc.
Games: #1 stuff little white gloves (the magic stretch kind) with cotton balls, whipstich closed, & decorate as a ghost using a marker. Use these for tossing games....into buckets, hot potato, etc. Can be used for many games.
#2 pin the tail on the black cat, using poster boards for the supplies.
#3 use a mini pumpkin for hot potato.
#4 decorate an orange playball into a jack-o-lantern & use empty milk jugs for "ghosts"....& play Ghost Bowling.
For other ideas, checkout FamilyFun's website.
Keepsake: use orange foam sheets & make pumpkin frames & insert a photo of each guest.