Have a search through some old threads on here - there have been lots of them!! My quick tips:
Try milk warmer than normal (obv not hot, but my dd liked it a lot warmer than the 'norm')
Different position to feeding/nursing
Mirror the position/bottle to feeding/nursing (wrap bottle up in a piece of clothing you have worn)
Different person and you disappear (at least 20 foot away!)
Try a cup (lid of a bottle) or a doidy cup (funny shaped cup)
Spoon feed the milk to DS.
Feed ds before you go out at 9pm and hope for the best?
If he is hungry, he may take a bottle / spoon fed / cup of milk, even just to quench his thirst until you return (my dd would do this, be v stubborn about the bottle, take a minute amount, settle and stay away until I returned!)
As for drinking, if you can look after yourself, you can feed a baby was my motto. Obviously if you are pissed as a fart, don't feed. The alcohol levels in your blood are different to that in your milk and it wears off, so you don't necessarily need to "pump and dump" either. Some people are really strict with this aspect, others (like me) are less so. Put it this way, I had a bottle of wine on saturday night to myself and still fed dd at 11pm. I'm more mindful of not co-sleeping with her/or being in a position where I might fall asleep whilst feeding her, so have someone around if you do decide to feed.
Have a good night out!