Hey Jenstar, it always makes me smile to see your name appear in the AdWords forum. ;)
In a technical sense, it is not your ads that have been disabled, but your keywords. And if your ad/keyword combination worked well previously, during the appropriate season, you probably don't need to change the ads themselves.
If I were in your position I would:
* First, delete the disabled keywords wherever they occur in your account. This is because if they're disabled in one place, then they'll also be disabled in every other place they're used. And they must all be deleted before you'll be able to re-use them.
* Re-use the keywords in a new Ad Group. In the new Ad Group, you can just duplicate your previous ad, if you feel that it truly can't be improved on. But, putting the keywords in a new Ad Group, even one with the very same ad, will give it it's best shot at success.
And, of course, as you create this new Ad Group remember that negative keywords are your friends!
Yeah, there really isn't a 'workaround' for seasonal ads, short of stopping them when the season is over. You can pause the campaign, delete the campaign, or (perhaps best of all) just set an appropriate end date in the 'Edit Campaign Settings' page for that campaign.
I really don't think this is necessary. Most likely, if the ads worked well seasonally before, they'll work again. But I do advise stopping them, to 'protect' the keywords from being disabled again post-season.
Best of success with this Jenstar!