If, as a white man, you want the freedom of speech to say the "n" word then you are going to have to deal with your audience having the freedom to call you a racist.
Don't worry though - you can just decide to not take offence to that.
And the venue manager will have the freedom to not book you too, because he doesn't want his establishment trashed.
If you can't tell the difference between a black artist using a reclaimed word on a CD and a covers band of no importance using it then I despair.