I'd get every zeta but Magnaguard, Shaak Ti (though hers are useful for another team, just not at all relevant for this event), and 3PO's "Wait For Me!", and Asajj's Zetas (although again, very useful for other teams)
Most the omegas are of use, except you might skip B1's basic since the protection regen will be based off Asajj Ventress who doesn't build around protection, Magnaguard's aoe special is kinda.. eh.. it's not BAD to get his speed up but remember buffs do give the GS team you fight more damage I think. You can also skip the 3PO omegas that are for Rebel and Resistance teams but get the one for Galactic Republic Teams. The characters you can leave low gear are Asajj (since her lead does very little, as long as she survives long enough to do a dispel it's probably enough) and Shaak Ti. The rest I'd have gear 12+, prioritize relics on GK, B1, Magnaguard, and Ahsoka, also nice to have relics on Padme and B2.. and a Droideka relic will mean more damage so it's not like it'd be bad.
