For future ones? No. Ayumi has these, though:
https://ayumilove.net/raid-shadow-legends-summoning-event-calendar/
https://ayumilove.net/raid-shadow-legends-guaranteed-champion-summon-event/
Ayumi calendar does look to be a bit off at the moment - likely thrown off due to the 2x weekend that happened around New Years, one for each shard type.
That said, schedule alternates every weekend between 2x/10x and the 2x (rarity boost) events follow in alphabetical order:
Ancient, Sacred, Void. We just had Voids last weekend, which means Ancients will begin on the 24th. Then Sacred 2x on March 3rd, Void 2x on March 17th.
For 10x (gives you a 10x chance on specific champions IF if you hit a specific rarity from your pull. does not boost your chances of pulling the rarities.) they are somewhat random. There are other shard events as listed in the link kram posted but most players want to be targeting 2x events.