I want to say sorry ahead of time for the long post im going to write but if you take the time and read it, im sure it will help you and allow you to fully understand the situation. First off, In my own opinion, i feel any combination of alcohol and most drugs can be taken with minimal ill side effects (within reason) and be a lot of fun and some great experiences. Regaurdless, the usual reason people would advise against this type of combination is because they are strong potentiators of each other causing more CNS depression than usually expected which leads to Respiratory Depression (mostly just uncomfortable) in the more minor side of things as well as loss of common sense and inhibitions if not too large of a dose is taken. As for the major ones that are WAY more common that you will probably believe (seriosly, look up the statistics, im one of them) complete Skeletal Muscle Depression, Hypoxia of the major organs including the brain due to Resperatory Arrest (happend to me with Buyter-Fentinal by accidental miscalculation of .3mg, fell straigth back, lungs stopped, only lived because Ethylphenidate and 2FMA where keeping my heart going, minor concussion, no Hypoxia luckily, slight memory loss), causing perminate brain damage which can possably disable parts of your body or turn you into a vegetable that has to be fed through a straw, among many other adverse effects that can occur if you dont actually die. Even if perfectly calculated, planned and executed, when you are in that mental state and not thinking clearly, You could end up taking more thinking you can handle it (sadly, happened to my best friend, total resperatory arrest and organ failure."RIP" brother.). With that being said, there are a lot of factors contributing to the effects you will get and from any dose based on your own personal tollerances, metabolism, sensitivity to drugs or lack there of. If you didnt know these things before hand, i want to make sure you fully understand the repercussions if not handled with extreme care. its possable to dose the perfect amount of each and have a great night and contine with your life, BUT the room for calculation error on the dose is VERY small, simply not knowing your tollerance fully or accidentally taking more than expected along with several other factors can (worst case scenarios) land you in the hospital, kill you, make you do something to perminetly hurt yourself, make you accidentally or purposefully hurt/kill others, or (best case scenario) you black out and you wasted your money, time, experience, etc.
So, it is definitely possible to do it perfect and have a great night that you remember, but the risks (and chances of those risks happening) out weight the benefits in my eyes. I would advise not to do it unless you are in a self destructive mentality or are 100% POSITIVE you know your bodys limits to the tee and you have someone sober and watching you. (Not trying to boast, sorry if it seems that way, im only trying to show my actual proven knowledge on the subject) I have a Major in Exercise Physiology, Cellular and Molecular Physiology, and Biology and Minors in Physics, Criminal Psychology/Psychopathology and getting close to earning a Doctorate in in Bio-Chemical Engineering as well as Bio-Chemistry, even with my experience with drugs and all the knowledge on how to do it carefully, i have only succeeded in taking benzos with alcohol 3 times without blacking out or waking up in the hospital, opiates and benzos is worse (dont even test it). I hope this helps and i hope you make the right choice for yourself, only you know your body and how it reacts, but if you habe no benzo tollerance, pease just avoid doing it, if you do, start smaller than you think you should, the work your way up over the corse of a couple hours while someone monitors you. Again Sorry for the lengthy post, just wanted to make sure you fully know what you could be getting into, i didnt know what could haplen back when i was more reckless and nearly lost my life and lost my best friend from 5th grade to current date. Just be careful.