Hi Sue, nice to meet you. The 100 Days team page is quite busy at the moment - there is a group of people who are on Day 90 - which was our 'official' group which started on 1st August in order to bring us up to the 'holiday season'!
Another group of people have been clamouring to start - so they're beginning today with Day 1 (minimal support from me).
The next 'official' start will be 1st January - and you're welcome to 'lurk' until then!
I haven't read Beck myself, but I have read a lot of people's blogs about it - and it obviously works very well with Linda Spangle's material.
Great to see you feeling so glad you didn't overeat. Social occasions are my bugbear and I have just started practicing not giving in around them. It feels awesome doesn't it? And so easy when you set your mind to it.