Dargason or Sedany
for a line of men facing a line of a like number of women, for as many as will.
This dance accomodates as many as want to dance, limited only by the amount of music available.
Reconstructed by Master Trahaearn ap Ieuan (in the proceedings of KWDS4).
Music: This dance needs a lot of repeats.  For 3 couples, I believe that the number of repeats necessary is 28.  So far, I do not have any recordings with that many repeats.
Part 1
Figure 1, Repeat 1
1&2: Couple 1 alone side left.
3&4: Couple 1 alone set and turn single (don't change places! - DCatC)
Figure 1, Repeat 2
1&2: Couple 1 pass each other on the left to side left with couple 2.
3&4: Couples 1 and 2 set and turn single.
Figure 1, Repeat 3-n
1&2: Pass your old partner on the left to side left with the next person in line.  
3&4: Set and turn single (left).
Dancers advance until they reach the end of the line and have no new partner.  They turn around, wait out a repeat, and start with the next person to come to them.
Continue until everyone is back to their places.  Couple 1 will start the next figure while the rest are finishing, like a progressive virus (duple minor) dance.
NOTE: with 3 couples, this section takes 12 (plus 1 of the next) repeats to complete.
Figure 2, Repeat 1
1&2: Couple 1 arm left with each other.
3&4: Set and turn single (left).
Figure 2, Repeat 2
1&2: Couple 1 pass each other on the left to arm left with couple 2.
3&4: Couples 1 and 2 set and turn single.
Figure 2, Repeat 3-n
1&2: Pass your old partner on the left to arm left with the next person in line.
3&4: Set and turn single (left).
Dancers advance as above.
NOTE: with 3 couples, this section takes 12 (plus 1 of the next) repeats to complete.
Figure 3
1-n: Hey with hands until you get back to where you started.
The KWDS4 instructions indicate that this hey takes 2 counts per change.  That's pretty damn quick.  My estimate of 28 repeats uses the 4-count change, which means that four complete switches happen in one repeat,
making it about 3 repeats to get everyone back to place (except that it really takes 13 switches to rearrange everyone, and there's no version of the hey that works out even if that's the case ….)