Don't panic ReezieJay, you can maintain when you get to RTM and you can enjoy yourself without eating and drinking everything you want.
If you go back to the way you were before doing LL you will put the weight on.
It's that boring old adage that permanently slim people follow - moderation!
You said you didn't have water on your week-end away. I find drinking water really helps. I start off with a drink of water. Sometimes I have black coffee and a glass of water as my first drink, then I feel quite full before I have the wine or G&Tor whatever. Then I try and alternate water/alcohol or at least have water on the go at the same time. It halves the alcohol, calories, expense and hangover - result!
Amazingly since being abstinent for a year I can take or leave alcohol now, used to drink every night before LL!
Keep calm, have fun. Maybe work out a plan with your LLC/Group.
Good luck with the move this week-end. xxx