When will the Eastern Conference Finals tip off for the Boston Celtics?

BOSTON -- The Celtics are on to the Eastern Conference Finals for the third straight season and the sixth time in the last eight years. But who they'll play for a trip to the NBA Finals and when the series will tip off will remain unknown for a few more days. Boston finished off the Cleveland Cavaliers in five games, thanks to Al Horford turning back the clock and leading the team to a 113-98 series-clinching victory at TD Garden …