The full schedule for the retro episodes is up now on the Jeopardy! website. Long story short: the weeks of August 3-7 and 10-14 will be a repeat of the Million Dollar Masters.
https://www.jeopardy.com/jbuzz/news-events/vault-4-weeks-jeopardy-milestones
I mentioned that earlier in the thread. The rest of the summer rerun schedule will be this season's college tournament (weeks of Aug. 17 and 24) and the last two weeks of the regular season (weeks of Aug. 31 and Sept. 7)
