Mistletoe and dine..."
Hire a chocolate chef. Give each child a cup of melted chocolate with cookies, pretzels, fruit and a lot of fun stuff to dip and ask the chef to involve the kids along with him in chocolate making.
Each child should have a definite work area with waxpaper to dry its creations. After they finish, each child receives a box with their names written on it and stuff it with all the chocolates they have made. You can adopt the Hershey kiss theme for the party. Make the invitations on computer with a chef hat and children mixing a vat of chocolate. Use white vinyl table cloths (from party stores) and decorate them with big Hershey kisses. Cut sheets of aluminum foil and tape the word kisses at the top of each one and cut them out like long labels on the chocolate kisses. Since this was a cooking kind of a party, the children are bound to get messy, its wise to buy T-shirts for each with a kiss printed on them along with the name of each one. Before the party gets over, take a group snap. Copy this image and use them as thank.