A 20th Anniversary Xena Convention in Auckland, New Zealand, 6-8 February 2015 is being planned . No guests have yet been announced. I would think, though, that because of its location, it presents an amazing opportunity to bring together many comparatively minor (but memorable) castmembers.
There are too many such folk to list, but here are some suggestions that leap to mind:
Joy van Uden (Rhea in KINDRED SPIRITS)
Tanya Dignan (Eponin in HOOVES AND HARLOTS)
Mia Koning (Tura in PATH OF VENGEANCE)
Barry Te Hira (Craigan in COMEDY OF EROS)
Jan Hellriegel (Priestess of Mnemosyne in FORGET ME NOT)