If you are a diabetic, I would not recommend booze. But if you must indulge; then the points to be noted [even for non-T2D] for hen weekend parties:
1. Watch the rate of consumption. Take it easy, consume very very little in each sip; take long time complete each drink; move around with your glass or mug or whatever it is - talk to different folks. Take some solid food in between the sips. By doing this, your body will be able to manage whatever your consume. Better to take 40 min to down 250ml of drink is safe. Usually most young patrons just take under 4 or 5 min to down 250ml stuff; some take up to 10min. Do not do that!
2. Take plain water in between. This is very important. In other words, rotate between drink and water. It is NOT same as mixing your drink with water or dilution. Even with the water; take long time between sips.
3. In any case; say a firm NO after downing third drink. You can pretend that you are already high. Three drinks in a night is too much even for healthy folks. Read about the limits of taking alcohol while trying lose weight. A lot of stuff is there on internet.
IMHO, going to party is all about enjoying, having fun; but definitely not for getting high, losing control, or throwing up what you downed.