I do this all the time. I have a Zoom H4n recorder and when I can, I use the built in mics to get the room and the inputs to get a board feed.
Just know this about board feeds - 99% you're getting the house mix, meaning that things are mixed for the room not the recording. As a result, if you don't have any bass in the PA, none will be on the recording. Vocals tend to be overly loud on the recording as they usually have to be pushed louder than everything else in the room.
Don't let this stop you from getting a board feed - just know that it may not sound the way you expect.
Just know this about board feeds - 99% you're getting the house mix, meaning that things are mixed for the room not the recording. As a result, if you don't have any bass in the PA, none will be on the recording. Vocals tend to be overly loud on the recording as they usually have to be pushed louder than everything else in the room.
Don't let this stop you from getting a board feed - just know that it may not sound the way you expect.