Hi Sidney. There was a slight error on the forums due to some confusion around time zones. The original post on the forums stated the event ended on March 19 at 4pm. This was corrected to the proper end time (March 18 at 5pm PST) a week ago on March 13 before noon PST.
March 25 was listed as (and still is) the date rewards will be claimable until. The rewards will become available to everyone shortly.