Wednesday 15 June 2022 07:00:00 UTC
Wednesday 13 July 2022 07:00:00 UTC
Wednesday 27 July 2022 07:00:00 UTC
Saturday 27 August 2022 07:00:00 UTC
EDIT: I believe there will be another offer, more expensive, with covenant coins (so during the Covenant of Champions) on Wednesday 31 August 2022 (07:00:00 UTC)