I've found it really really hard to get back on track, I'll manage it for a few days, and then start eating crap! The first time on CD is the golden time! I'm having another re-start tomorrow, but my husbands cousin is starting tomorrow too, so hopefully that'll be a bit of motivation I need (as if being a heffa isn't motivation enough!)
I guess you just have to be really strong when you get back. Don't use the conference as an excuse to binge though!