Stress (good stress as well as bad) can really affect the amount of energy you have, and weddings are one of the most stressful events imaginable. Once you get Robin Hood out of the way, give yourselves a couple of days off - and I mean really off - everything. Other than work (unless you can get a day or two off), do nothing - no housework, no writing thank you notes for wedding gifts, no visiting Auntie so-and-so who wants to see the newlyweds, etc., etc., etc. Get extra sleep, check that your diet hasn't slipped to too unhealthy due to time constraints, veg out in front of the telly. In short, give yourself a life recovery session. That should give you the energy you need to get back into the training with gusto.
Oh, and by the way, congratulations!