So, in April, we will get a banner with those guys on rate up:
5★ Nero Claudius (Bride) (Saber)
5★ Gilgamesh (Archer)
5★ Karna (Lancer)
5★ Tamamo-no-Mae (Caster)
4★ Gawain (Saber)
4★ Nero Claudius (Saber)
4★ Emiya (Archer)
4★ Elisabeth Bathory (Lancer)
3★ Robin Hood (Archer)
3★ Cu Chulainn (Lancer)
But that's a lot of 5*s, and I only want Tamamo, for my arts teams (I suppose Nero Bride helps on that as well...).
There will be days some 5*s are on rate up, or will be all campaign having all of those at once?
That's the first option, there will be only certain days with certain rate up servants. The dates are here: https://grandorder.wiki/Fate/EXTRA_CCC%C3%97Fate/Grand_Order_Pre-Event_Campaign
So if you want Tamamo, you should summon the 25th.
Edit: And the May 2nd as well
This is what JP got:
https://grandorder.wiki/Fate/EXTRA_CCC×Fate/Grand_Order_Pre-Event_Campaign
Near the bottom of this page it suggest we will get two days when Tamamo will have solo rate up and at the end she'll be rate up with Karna, Nero Bride and Gil.
It appears as though they will all have solo rate up days and there will be two days when Gilg and Nero Bride will be rate up together.
Hope this answers your question the best my clairvoyance can, or leads you to what you want to know.
If it goes the way the JP one did The 5* will have both solo rate ups days and days they are on rate up together.
As far as I can see, the 4*s will all be on rate up at the same time.
