You can make cheesecake from Tofutti (vegan cream cheese), using Nuttulex and lactose free biscuits as the base?

Cake using no dairy or dairy subsitutes?

I made awesome vegan brownies once. You could serve it with lactose free icecream or make a creme fraiche using Tofutti and lemon juice?

Baklava? There was a thread on this recently.....yummmmmmm

Pavlova/Meringues served with fruit

Something with marshmallows (I'm pretty sure they have no dairy but I may be wrong)

Depending on the type of party as you'd need bowls and spoons for this.........Sticky Rice Pudding with Mango (a Thai dessert, the pudding is made with special rice from the Asian supermarket and coconut cream - soooooo good particularly in this summer weather)

If you google Vegan desserts you should find heaps. I know you don't specifically need it to be vegan but you can always substitute the vegan alternative for non-vegan except for the dairy. I have found that searching for vegan comes up with wayyyy better stuff than just lactose free. There are some really yummy yummy vegan desserts out there.