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From the Riot Games announcement:
Day 1 - Thursday starting at 15:00 CEST / 6:00AM PDT
All-Star ChallengeEurope vs ChinaKorea vs Southeast AsiaEurope vs North AmericaSoutheast Asia vs ChinaNorth America vs KoreaDay 2 – Friday starting at 13:00 CEST / 4:00AM PDT
All-Star ChallengeKorea vs ChinaNorth America vs Southeast AsiaEurope vs KoreaChina vs North AmericaEurope vs Southeast AsiaTiebreaker (if necessary)Day 3 - Saturday starting at 13:00 CEST / 4:00AM PDT
All-Star ChallengeSemifinal Match 1Semifinal Match 2Day 4 – Sunday starting at 13:00 CEST / 4:00AM PDT
All-Star ChallengeInvitational FinalsStarting on Monday, March 31, tickets will be on sale at lolesports.com.
Yesterday, Riot released more information on how the All-Star voting will pan out.