We know the dates of most of these and the relative dates are certain, so guesstimates can be made on the rest:
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PvE to PvP transfer restrictions removed - already happened June 21
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Wrath Classic closed beta test - already begun
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Classic Era clone service retired - happens July 26
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Summer XP event (the 50% buff) - (“coming weeks” from June 22) Duration 6-8 weeks - few weeks before pre-patch until lauch - Guess: July 13
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Existing realms ‘consolidated’ - August 10
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New Fresh Start Realms with Wrath Classic pre-patch - Guess: August 10, or more possible 17
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Wrath of the Lich King launch - Guess: September 14/21/28. Even before SoM closes down on 16 November