That lineup might not be the best idea. You have two counterattackers in there. That said, Sun Fac's dispel on basic could be useful, and the out of turn attack protection up isn't locked until T7, I don't thing.
Getting seven star Padme with this lineup isn't likely, due to the large locked protection up.
That said, who's good for the event is unclear at present, considering so much of the faction has been reworked and we're probably getting some Geonosian reworks before the next time the event rolls around, so who knows how they'll perform?
Speaking specifically to your setup, Asajj lineups to get five star Padme tend to rely on an overwhelmingly powerful Asajj (G12+ with around +70 speed, +1000 offense via mods) with her unique zeta at a minimum, fed by the death of allies. Which requires a G12+ zAsajj, of course, and is better served by a Nute Gunray than some of your allies because he can die twice. Even that isn't gonna cut it for 7*, and you'll need a more dedicated Separatist lineup.
With a low gear Asajj, to get by with her at a lower bar even at the five star level would require the team to pick up quite a bit of slack.
Spy is pretty clutch for this one because he eats debuffs to deal large amounts of damage, two very valuable things. Dooku and Sun are a mixed bag. B2 is a very important unit. Asajj is... good with an asterisk but doesn't necessarily integrate well
Dooku's lead in particular is highly highly questionable for this event, because Padme punishes out of turn attacks so severely with that 40% protection up. Nute Gunray or General Grievous would probably have the more useful lead for this event.