Jim Bunning’s perfect game.
That was on Father's Day; I remember Dad and PopPop (mother's stepfather, both granddads had died when my parents were young) in the backyard grilling, probably burgers, and the B&W pseudo-portable was on a porch table on Ch. 6, which at that time was WFIL, broadcasting the Bunning perfect game. I had just turned 10, and vaguely understood that something big was happening.
That was also the infamous 1964 season when the Phils dropped ten games in a row the last two weeks, and let the Cards win the pennant on the last day of the season. It took ten years, Mike Schmidt, Steve Carlton, and Greg Lusinski to bring the Phillies back into contention.