To be fair, most weddings last less than a year – although some certainly feel longer! 
Memorial Day, I think. Let me check…yeah, it was Memorial Day.
Does April 1st (April Fool’s Day) count? No, that’s not a joke either. It’s just when the venue we wanted had an opening in the March-May period we wanted the wedding.
We did the civil ceremony a couple weeks earlier (mostly for insurance benefits) and that was on St Patrick’s Day.
Huh, similar to us. It’s my birthday, our wedding anniversary, and sometimes MLK Day. Not MAJOR holiday, but some people have the day off work. We too had a very small wedding, officiated by my husband’s cousin, attended by all of 6 people, including the officiant/cousin’s 3yo son.
We got married on Christmas Day.
As it turns out, my mother is a celebrant. So we paused the Christmas festivities mid-afternoon, changed into formal-wear, recited vows, then changed back again and resumed Christmas. No guests present; just family. It was kind of nice, actually. 
The only real downside was that we were at my brother’s house (since he has plenty of space), and he has a dog. After we cut the wedding cake, I got the very first slice…and I took my eyes off it for a moment as I sat down. Result: one happy dog…
April 26, 1997 - a day of absolutely no significance to anyone, anywhere, except the townspeople of Viburnum, Missouri (our wedding was the talk of the town that day - considering there’s little else to talk about in this town, ever).
We did. But since it occurs once every four years, it was no big deal then, or now (well, next year).
I helped orchestrate a surprise wedding on Thanksgiving day that was pretty fun.
I married my first wife on July 24, then promptly moved to Utah, where Pioneer Day is, without exaggeration, 95% as big a deal as Independence Day. Seriously. It’s such a big deal that mail isn’t delivered on Pioneer Day, a case of a state holiday trumping a Federal agency. Rain, sleet, nor snow may stop the mail from being delivered, but endless parades of Mormons in Little House on the Prairie clothes are apparently instant death.
We had no idea, of course, when we chose the date.
So I spent ten years in Utah with people assuming we’d done it on purpose, and saying things to the effect that, “Well, that’s one way to guarantee you always have your anniversary off!” with big, shit-eating, Bob’s-yer-Uncle grins. Unfortunately, it also meant there wasn’t much to do on that day, since many restaurants and theaters were closed.
In slightly happier and more fitting fashion, that marriage was legally dissolved (via divorce) on Guy Fawkes Day, ten years later. Remember, remember, the Fifth of November? Oh, I do. With a smile.
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My wife and I got married on our anniversary, which has become a sinificant holiday in our house. And people say coincidences don’t happen…
Our school had several silly things going on just before grad. As far as I was concerned it was a holiday, we got married on Senior Ditch day. Had them mail me my diploma and it was there when we got back from our honeymoon.
We got married on Halloween. We didn’t plan it from the get-go, but it fell inside the months we were leaning towards, it was available and it was a Saturday. It’s also my favorite holiday and an easy to remember anniversary date.
I WILL say I was also a bit tempted by the Friday, too; it’s Devil’s Night here and the idea of telling folks we got married on Devil’s Night is an entertaining one. 
(In a similar vein (though not holiday-related), a couple of friends got married in Hell. The marriage certificate is framed and on display. It’s awesome).
You all DO know that Thanksgiving and Easter change every year?
IOW. No, we did not get married on the day of a major holiday, but once every 6-7 years our anniversary falls on one.
I proposed on Presidents’ Day and we married on the Summer Solstice in 2002.
We said “I do” in 2002, is how I remember it.
Not a holiday anywhere else but November 11th is the start of the Cologne Carnival season und quite major here.
We got married on 11.11.11 - as did literally hundreds of other couples in Cologne - and luckily decided on the date early enough to still find a vernue.
It was a lot of fun: everbody was dressed in costume and it was a wild, loud, happy party.