They had a monthly one near downtown Dallas for a bit, but I think the guy sponsoring it moved or something.
Only one I know of coming up is this:
http://dallas.craigslist.org/dal/bik/1330821902.html
"We are having our 13th Annual Vintage Classic Bicycle Swap Meet on Saturday Oct 17th at the Bicycles Inc parking lot. 143 E Harwood.
The Vintage Bicycle Club of Texas hosts this event.
Last year was our biggest ever. Bring out whatever you want to sell.
If you want to push a bike around to sell you can for free but spots are $10. Setup time is 7am and the meet starts at 8am.
More links and postings will be done as the time closes in. Hope you see you there. "
As I recall, this is more nearly "antique" bikes, as in old cruisers and stuff, not so much 80's & 90's "vintage" high-end bikes.