Sorry, no, it is not on the dining plan.
Not sure when the tea party is now. One website says it is Monday - Friday from 2 to 3 PM, another says MWF 1:30 to 2:30. No matter when it is, it will run one hour. It costs about $40 per child. Only potty trained children age 4-10 may attend - no parents. The parents get pagers.