With visitors flocking to Sin City for the Super Bowl this weekend, you'd figure there's no better time than Saturday/Sunday to say "I do" ... which is exactly what the Little White Wedding Chapel is thinking, and why they're extending an invite to Tay Tay and TK.

The wedding venue tells TMZ they're offering Taylor and Travis a comped marital service if they're feeling like tying the knot at some point this weekend ... and their doors are open for business, even though they'll completely cover the cost.

LWWC says, "Taylor and Travis – you two have enough on your plate so let us take care of you! Taylor just bring your lucky, and Fabulous Grammys gown and we can handle the rest! We have our florist on standby for the bouquet of your dreams, our ministers and Elvis are ready too. Whatever you want, our chapel is ready to take care of you!!

BTW, their offer here doesn't just extend to T-Swift and Travis -- it actually applies to all the football players and their significant others who might be in town in the next few days.

We're told Little White will cover the costs for any of the San Francisco 49ers and the Kansas City Chiefs team members, including coaches -- anyone affiliated has the chance to get married there ... for free. From the aisle to the pitch ... that'll be one tight turnaround!

A complimentary confetti canon will be incorporated into the celebration for members of the winning team. Talk about scoring big on and off the field. Both SB teams will get specially created bouquets for the occasion, which will make it an even playing field for everyone.

LWWC also notes that while wedding days are traditionally all about the bride ... they wanna show some love to the SB men, 'cause the sporting event is one of the most exciting and important things happening in Vegas now. So yeah, they wanna show the dudes love!

They also tell us they hope the offer can serve as an added promo for the venue ... with football fans coming to the chapel to get married in a spur of the moment kinda deal after the game. Don't expect them to cover those weddings though -- just SB heads, y'all.

Not that the chapel really needs it ... with the likes of Ben Affleck and Jennifer Lopez, Britney Spears and Jason Alexander, and more celebs exchanging vows there -- with an Elvis impersonator as a witness, of course.