Can I shave before Brazilian Butt Lift and maybe Tummy tuck??

You should ask your surgeon for specific instructions about this. I ask my patient to shave 2-3 days before the surgery, but not the day before or the day of the surgery, as you can have small cuts that may not heal by the time of the surgery and you may have some irritation that can create a problem, like an infection in the area.

It's best to be shaved 30 minutes within the time of incision to avoid infections of the skin but since liposuction involves minimal incisions I am not sure if it makes a difference in your case. 

Problem with shaving before surgery is that small cuts and scrapes may nest bacteriaMy recommendation would be to just trim short the night before surgeryAnd also consider laser hair removal later on, so you free yourself from this shaving hassle.