Yes, you certainly will make it to Christmas and beyond, still where you want to be weight-wise and healthwise. You're so on top of all this - and too aware to just let all that you've worked hard for slip away! Of course there'll be seasonal treats, but if you're having just a little of some nice thing - something really worth eating - eaten along with some top-notch fancy salads or grilled prawns or whatever - you'll be fine! And that's the kind of eating we're aiming for, not grim dry Cruskits forever. As for a once in a way Christmas feast or birthday treat... well, "it's a poor heart that ne'er rejoices" to quote an old family saying.
I think the tactic is to be quite consciously selective about what we choose - which I admit I used not to be - show me a buffet, a few years back, and I'd have one of everything! But now (I hope I can keep this up) I will survey what's on offer and take just what I really want.