How much are you planning to drink? Generally each unit of alcohol takes an hour to clear, so 6 units will be gone in 6 hours. To be honest though such a tiny amount gets into your breastmilk that I wouldn't worry about it.
If you're so drunk you can't see straight then you're a danger to the baby whether you're breastfeeding or not. If you can safely handle the baby then you can safely feed.
You don't have to pump and dump - alchol enters breastmilk the same way it enters your bloodstream, so as you sober up the alchol leaves the milk. Best time to drink is whilst breastfeeding because there is a short delay in alchol getting to milk, so generally you have a few hours until next feel for milk to leave system. Enjoy your drink
I find atm, having been preggers or bfeeding for the last 3 years, I can't really drink much at all any more, one glass of wine and I'm a bit squiffy.