Welsh tunes for dance set

Our amateur ceilidh/ceili/whatever band might soon be playing a private gig at the London Welsh Centre. I don’t know yet what the occasion is, but I assume various Welsh people will be listening & dancing. But our group hasn’t got any Welsh tunes in its repertoire.
I’ve checked some previous discussions, but what I’m desperately looking for, as soon as poss, is suggestions of a specific set that would work for dancers. Maybe two sets, but the band won’t have time to learn more, and we’d rather not be staring at notation while people dance (even though I’m hoping for notation so we can learn them).
Any ideas? Otherwise we’ll be subjecting them to Irish, English, Scottish, American, Swedish etc.

Are you looking for Welsh dances or just Welsh tunes? With the exception of the two set dances (which your caller would need to learn), the tunes listed below should cover all bases as far as English, Sottish and Irish ceili(dh) dances are concerned. They are not necessarily all truly Welsh in origin, but they are all common tunes in the Welsh twmpath*/session repertoire.

Polkas/Reels(16 bars):
https://thesession.org/tunes/13631
https://thesession.org/tunes/14507
https://thesession.org/tunes/14832
https://thesession.org/tunes/9400


Polkas/Reels/Hornpipes (32 bars):
https://thesession.org/tunes/2146
https://thesession.org/tunes/6345
https://thesession.org/tunes/6341
https://thesession.org/tunes/1995
https://thesession.org/tunes/11583
https://thesession.org/tunes/6368
https://thesession.org/tunes/9394


Polkas/Reels/Hornpipes (48 bar):
https://thesession.org/tunes/13587
http://abcnotation.com/tunePage?a=trillian.mit.edu/~jc/music/abc/mirror/BrianMartin/CadwTwmpath/DwrGlan/0000


Jigs (16 bars):
https://thesession.org/tunes/4426
https://thesession.org/tunes/1910

Jigs (32 bars):
https://thesession.org/tunes/2245
https://thesession.org/tunes/12589
https://thesession.org/tunes/14512
https://thesession.org/tunes/10445 (normally 24 bars, but A-part can be repeated to make 32)

Slip Jigs:
https://thesession.org/tunes/6438
https://thesession.org/tunes/6436

Waltzes & other 3/4 Tunes:
https://thesession.org/tunes/6444
https://thesession.org/tunes/6373
https://thesession.org/tunes/14519
https://thesession.org/tunes/2910


Set Dances:
https://thesession.org/tunes/6376
http://abcnotation.com/tunePage?a=trillian.mit.edu/~jc/music/abc/Wales/set/LazyRobin/0000

*Twmpath is the Welsh equivalent of a Ceili or Barndance.

The March of the Men of Devon (translation of the Welsh title)
Captain Morgan’s War March
Cader Idris (waltz) aka Sweet Jenny Jones

Two spiral-bound books, ‘Blodau’r Grug‘ and ’Cadw Twmpath’ are the regarded by many as the go-to source for Welsh dance tunes. There is, of course, a wealth of lesser known tunes out there, but these two volumes probably contain most of the tunes I have listed above - and many more besides. The tunes are also grouped in sets, with suggestions for dances to accompany. You might find some of the keys inconvenient (some in C, some D but with a range that goes right up to D on the E-string). I suspect this is because they have come straight from harp manuscripts - so you can perfectly legitimately transpose them to suit whatever instruments you play.
http://www.gwales.com/goto/biblio/en/9780000678683/
http://www.gwales.com/bibliographic/?isbn=9780000179234&tsid=5

Thanks to Creadur & Ebor. Definitely our caller won’t have time to learn to call anything before this gig, so we’ll try to learn at least a set or two that might work for some dances he CAN call. And if they end up to be “just” instrumentals without dance, no problem. I’ll let you know how it goes.