Terpsichore, the muse of dancing.
How to portray this on elfinspell is a matter of ongoing 
debate.
For now,  vigorous play and artists of movement seem 
apropos.
Mummers qualify as well.   As here in
the St. George Play.  
What a treat this would be as a school production at 
Christmans time, as a change for kids and parents!
Acrobats have a special gift, and Terpsichore must be 
their muse.   Take a look at two versions of this very old 
legend, Our Lady's Tumbler.  It is easy to imagine 
Baryshnikov in the lead, if this were to be turned into a 
performance today.  The first English translation is by 
Wicksteed
and the second is by Eugene Mason.
Last  (for now) an entry about tennis, from the Dictionary 
of Faith and Folklore.   A little about the History of 
Football as well.  After all,  Sports  need muses, too.
Okay, found some more.  How about some skits from 
Ancient Greece,  this is the only complete English 
translation now up on the web of Herondas aka Herodas 
from the third century B. C.  It's an eye-opener, that's for 
sure.   Take a look here.
The Clay-Cart, the Oldest Hindu drama, c. 1st or 2nd 
century B. C., translated and abridged by Sir Monier 
Monier-Williams.
And another more modern odd and funny Mummer's Play 
can be found here, called Inside Stuff, A Gastronomical 
Fantasy, by Theodore Pratt.