The trick is to try to rethink what you mean by a "good time". Not thinking about it as meaning food and drink, but meaning friends and music and laughing and talking, etc. Try thinking of the food and drink as incidental to all that.
I want to second this. Very heartily! I have always revolved my social life around food/drink - I am one of those who demonstrates love with food. I have had to massively change that, and it is hard. In my first week on slimming world I went to a music festival, camped thursday-monday and was with my partner and friends, who were drinking lots and eating all the yum festival fast food. I had one drink while my favourite musician was on, brought in sachets of options when it was cold in the evening and had a nice hot chocolate (amusingly it was nicer than the supposedly posh hot chocolates they were buying to put booze in), and reminded myself that I was there to see bands and be with my loved ones. I did have one strop when the only food available that fit into SW was some raw cabbage and carrot... But I ate it, sulked and then got over myself.
We do a 'come dine with me' style evening, too - my partner is in a band and they take it in turns to cook for everyone else, and have completely included me in it all too since I moved into the area a couple of months ago. I explained before I came that I was doing SW and offered to bring something for myself so I wasn't being difficult, and they've all gone out of their way to make me something that fits in with slimming world. I still have a couple of drinks that night - possibly more than my syn allowance (definitely more than my syn allowance! But only a little and I'd allowed for it the day before and after) but otherwise stay on track.
It is really hard and sometimes you have to choose between whether staying on plan and having the losses you want is more important to you, or if having a night out and eating what you want is more important to you. So far, for me, I want to stay on plan. I fell off massively once and gained back all I'd lost, and I was so disappointed in myself that I have to do it all again that this time I am so bloody motivated to be on plan as to be ridiculous! That said I do know there will be days when the day overall will be more important - on those days I'll either do damage limitation and try not to gorge myself stupid while its "allowed" (which is what I am liable to do given half the chance - I'm a dreadful self-saboteur), or just write the day off in terms of diet and have what I like. But on those days you just have to acknowledge that they will affect your losses, so you need to be prepared for it, and not beat yourself up over it. If you have a day off for a wedding or celebration, have a day off. Just don't have a week off or a fortnight off...
The whole point of slimming world is that you are reprogramming your unhealthy and unhelpful eating habits and replacing them with healthier ones. A treat is fine, you just need to keep it as that. Everyone has them! Slim people have them and people who've been overweight their whole life have them, athletes have them, everyone. Its how you respond to it afterwards that makes the difference.
