Will the crowd even notice?
I have a few gigs now, and I think the answer is, sadly, no they wont. The only ones that will are any drummers that are there(very offputting if they stand at the front and airdrum, look the other way if they do)
Obviously you need to play the right beats and have good dynamics. And any signature fills need to be there. But unfortunately after all the work i put in to be true to the track, I soon came to notice that the only thing they notice is if you have bad time keeping, or if you go so wrong you throw the rest of the band off. I have made mistakes on stage, but usually covered them well enough, and just moved on.
As i said before when i am learning a new song i always make a chart. on simple songs its just the number of bars for each section and notes on what drums to use. On most songs though i write drum music. i use the charts at rehearsal until i find i am not looking at them any more, it just seems to naturally happen. On some of the more complicated songs I play them with the band without adding the fills and some of the hi-hat work to start off with until i realy know the song, and then work on the fills till they are perfect and pop them in once i have them under my belt, only the bass player seems to notice.I think all the band eally want is the right beat, and dynamics at a constant tempo and the signals they need for any changes. I do practice by myself to the track, but to get the thing really in my brain i play along to a metronome whilst reading the chart. If you can do that 10 or 20 bpm faster than the speed it should be it really helps and it seems a doddle when you play it along to the track later.
I do strive to be note for note perfect, unless there is a technique which is beyond me. I do it for my own satisfaction and I think it sits easier on the listeners ear if the drums are like the original, but if I fluff it I dont beat myself up about it.
If you make a mistake playing with the band or live stick with it, who says this section should be played on the hats or the ride, that will sound much better than changing half way through. If you dont come in at the right time, hit the bass or the hats to keep the beat and come back in at some musically sensible point, and something the band will recognise. If you make a mistake playing on your own stop and play that section again, dont move on till you can play it without mistakes.
One band i played with had I thought a brilliant practice technique. They had the set list and without stopping we played the whole set but just the introductions and the outro (we obviously agreed which bits we were going to do. I just clicked them in, we played the intro followed by the end bit and straight onto the next song. Really reinforces who has to start and gets the begining of each song in your head. And highlights any long pauses where the guitar player are twiddling with settings
Anyway good luck with your gig, remember that cover band playing local charity gigs are a huge range of standards, you will probably be surprised how good you are in comparison. The main thing is to enjoy the performance, and remember they are there to see live music, not some monkies miming to a backing track.