I'd have been happy to have it launch a day after Conquest ended last time, but it didn't.
They can't have it start precisely mid-month, nor end of month/beginning of month since that conflicts with Executor and Profundity events.
7th/22nd seem more likely to space out the advanced cap ship events, but I couldn't say which it will be. I thought that they would be giving us less notice, as they often do, but I would have thought that they'd be going for the 22nd of last month in that scenario.
Would they really wait a whole month? They do often give significant lead time on GLs, and Levi is certainly equal to or exceeding a GL in investment. Even so, I'm thinking the 7th or 8th, the timing decided by the necessities of spacing out advanced cap ship events more than anything else.