Buffalo Bills fans swarm Los Angeles ahead of season opener Vs. Rams

Don't be surprised if SoFi Stadium has a strong hue of blue and red during Thursday night's Rams vs. Bills game...because if Wednesday night is any indication -- THOUSANDS of Buffalo fans will be there to support their team at NFL Opener.

TMZ Sports has obtained photos and video from a Bills Mafia dating event in Hermosa Beach just 24 hours before Thursday's kickoff...and you can see hundreds of people wearing Buffalo gear flocking to the bars and restaurants in the area to party before the big game.

TMZSports.com

Dozens of fans dressed in Josh Allen jerseys drank beer, chewed on wings and shouted "Let's Go Buffalo!" songs.

People even hung up signs and posters of businesses in town...and we're told the party went well after midnight.

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The first whistle for Thursday's contest will be around 5:20 p.m. PT - but Buffalo fans already planned a big tailgate at SoFi Stadium hours before.

And, yes, we're sure tables will be broken and Zubaz pants will be plenty.

You have been warned, Rams fans!