Today In NHL History - Boston Blackout

On May 24th in 1988, a transformer blowout blackened a fog-filled Boston Garden with 3:27 remaining in the middle frame of Game 4 of the Stanley Cup Final between the Boston Bruins and the Edmonton Oilers.
Deemed an Act of God, NHL president John Ziegler canceled the 3-3 match rescheduling it two nights later at Northlands Coliseum.

The Oilers won Game 4-A by a score of 6-3, sweeping the Bruins en route to their 5th Stanley Cup in 7 years and setting a modern record for the fewest games needed to hoist the hardware (18), in what would be Wayne Gretzky's final game as an Edmonton Oiler.
That's today in NHL history.