On August 27, 1990 — The Brewers-Blue Jays game is delayed 35 minutes when a huge swarm of gnats descends onto the field through the open SkyDome roof. Milwaukee scratches out a 4 – 2 win.
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Sources:
Baseball Reference August 27
National Pastime August 27
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game