Gold / Coin - I'm not actual farming for it.
It come by itself when I run 80 stamina main-event map and reissued-event map.
Normally I will run those two 80 stamina map for event currency.

Gacha Seed - I just burn it for extra money or summoning luck befor do single FGs roll.

Equip Seed - I random roll it from time to time to do some enhance for event equipment.
Most of my main girl have only 1 or 2 equip slot so I just let it be for now.

Manyu - I always run manyu map for fun since I still have many girl for leveling.
I may use 1 or 2 FGs to do extra run if I feel carried away.
I may stock up some Lv100 manyu for leveling my new girl that I like from time to time.

Dragon - I never stock any dragon except left over Lv100 one.
If I want it I just run for it right away on event day.
If I really need it BADLY I will spend 2-3 FGs to do extra run.