Was going to go, but can't now....
You'd probably need to contact the venue re: the drinking rules.
At Upton Park we could booze and watch the boxing, likewise at Liverpool Echo...but at the Royal Albert hall I had to finish it before I went in...so it depends
Here's the link...
Doors from 5.30pm, first fight probably 6/6.15?
It's sold out though right? But there'll be loads of touts and tickets online if you need one.