GSSR

Should be one for 2nd anniversary. The actual anniversary is end of June but, like last year, it'll probably be celebrated in July
https://grandorder.wiki/Fate/Grand_Order_Fes._2017_～2nd_Anniversary～

2nd year anniversary... During mid July or Early August. Also includes limited servants.

https://fategrandorder.fandom.com/wiki/Fate/Grand_Order_Fes._2017_%EF%BD%9E2nd_Anniversary%EF%BD%9E_Lucky_Bag_Summoning_Campaign

Yes, somewhere im july, the second anniversary lucky bag. You will be able to summon one of any SSR to date (limited included). But everyone is in the same banner so good luck.

2nd year anniversary : 1 Banner

January 2020 :

-1 Banner (3 Knights Class: Saber/archer/Lancer) + Ruler + Avenger

1 Banner (4 Horsemen : Caster/Rider/Assassin/Berserker) + Alter-Ego + Foreigner