Yeah, I do carry (2) 1/4" female to RCA male adapters for that RCA female output too. My experience has been that most guys are prepared for 1/4" out from the sound board. In all the years I've used them I can only remember two times when someone wanted to patch into the board after me...
I have an entire bag of cables and gender benders that I've never used, I was so excited when I got the opportunity to record live on a regular basis I just went on a shopping spree so I would not show up unprepared haha. come to find out they have EVERY output maxed out and most of them already running splitters.
I just recently found out this venue I typically record at does have ONE available 1/4 mono aux out on the SB, so even though the SB tech has no knowledge of attaching recorders to it he has been more than helpful to try to get me a good feed from it recently, however it is usually hit and miss. one band I may get all vocals/snare guitar. next band may have a perfect mix, next band may be all bass drum and bass guitar.
So it always pays off to be prepared, I have too many cables but I am glad I do, I recently trimmed down the luggage to just one 1/4 mono to 3.5mm stereo, 1/4 mono splitter, 3.5mm splitter xlr f and m plus xlr splitters and an xlr with a built in attenuator to 1/4 and that seems to cover every plug type in the club and on my recorders.
I love doing this and I read this forum continuously to learn more, I am eager to master this, it is truly a great hobby and loads of fun!