As has been well said by many, this is a very dangerous combo. Not just in terms of health but also other potential dangers such as ending up in a police cell with no memory of what happened, or a hospital, or a ditch and it is very hard to keep track of how many pills you've had and how many drinks. I'd only recommend 10mg and a couple of beers indoors on your own, depending on tolerance (maybe 30mg if you have a higher tolerance and just want to chill). Wouldn't recommend loading up on pills and drink and then hitting the town. Chances are you'll be hugging a lamppost, pissing your pants and getting wound up by some rowdy yute and that's if you're lucky.
I used to do shit like this all the time as I basically had a death drive due to all kinds of shit happening in my life - I didn't care if I lived or died: benzos, H, pregabs, coke, drinks and I don't remember a lot of it. Some fun nights in hotels with the ladies and some one night stands, also even a couple of relationships which naturally didn't last but also some dangerous situations and plenty of blackouts. Worst I actually remember was waking up with blood all over my pillow which looked like a big bush or something as my hair was long. I don't remember what happened but I'd obviously been hit in the back of the head with a blunt instrument. I vaguely remember the area and that a lot of stupid beefing was going on but otherwise, it was a mystery.
It is basically a rule of thumb that mixing benzos with alcohol is a stupid idea that can lead to all kinds of trouble and should be avoided. If you feel like you must then be very careful and watch your intake - have a pal around who can keep an eye on you. Like a trip sitter for those of us who like our downers. One benzo and a couple of pints of Guinness might have you feeling like Mr Smooth but you can easily tip over that cliff edge. A very fine balance and a thin line that you cannot see and will have crossed before knowing it if you're not careful.