How To Watch Miami Heat vs Boston Celtics NBA Game 3 Live Stream, Game Time Info byRick Viscomi •May 21, 2022 The Boston Celtics and the Miami Heat take the court in Game 3 of the Eastern Conference Finals. The Celtics are favored by 6.5 points in the matchup, which begins at 8:30 PM ET. FREE NBA LIVE STREAM: Watch Celtics vs. Heat for free with a 7-day …