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Suburban social pressure dictates that Rob (Dick Van Dyke) and Laura (Mary Tyler Moore) throw a lavish birthday party for their son Ritchie (Larry Mathews). But Rob draws the line when Laura wants to rent the "Dizzyland" amusement park for Ritchie and his guests. Why not, Rob suggests, save money by having the party in their own back yard? A terrific idea -- except that the lawn is being fertilized, forcing 63 youngsters to jam into the Petrie living room, and compelling Rob to come up with some entertainment in a hurry! Tony Paris, son of episode director Jerry Paris, appears as one of the kids. "Happy Birthday and Too Many More was filmed the weekend after the J.F.K. assassination on November 22, 1963, at which time the producers concluded that a studio audience would not be in the mood to laugh; as a result, this was the only episode of The Dick Van Dyke Show that was not filmed in front of a live audience.