Derek Carr and several Raiders teammates were just hit with hefty fines for going mask-less at Darren Waller's charity event ... with the QB reportedly getting hit to the tune of $15k.
The Raiders tight end hosted a fundraiser in Henderson, LV last week -- which included an auction to help those fighting drug and alcohol addiction.
Several guys like Carr, Nathan Peterman, Jason Witten and more attended to show support ... and the event was a huge success, raising more than $300k!!
Only one issue -- several players and guests were pictured without any sort of face protection, which violates the NFL's strict COVID-19 protocol.