The Shorty's PowderPuff tournament is happening May 22 this year:
http://www.skill-shot.com/content/shortys-powder-puff-tournament-2,699
The other ladies are trying to talk my wife into playing this time around.
Incidentally, it's been observed that the SPL does have more ladies as members than any other pinball club. There's a few ladies in Vancouver, BC and a few in Portland, including the incredibly intelligent super-engineer Jeri Ellsworth!