I would say just move on because of the situation. He wasn't expecting gifts anyways and well the party not happening is mom's problem to explain not yours. Means she may have been getting pressure from the new daycare to start him early to secure the spot and well this gave her an out without giving proper notice. Sometimes in this kind of a situation it is best to just let them go. Remain all happy and positive but leave it up to mom to make the next move social wise/vist etc.