Watching the world's greatest athletes duke it out in the Olympics is awesome -- but if anyone involved in the Paris Games ever gets bored, they got one helluva backup plan ... thanks to a local cabaret offering FREE visits!!
The folks at Secret Square -- one of the highest-rated adult venues in Paris -- tell TMZ Sports they're prioritizing those hard at work over the next few weeks ... and they want to welcome all the participants (and those covering the event) to their establishment.