This Thursday, May 10th, will be exactly ten weeks since March 1st and the Shadow of Malachor marquee event for Visas Marr and Darth Sion. https://forums.galaxy-of-heroes.starwars.ea.com/discussion/1...
Is your question if they will narrow that down and give you a specific date? Because if so, the answer is "of course not, why would they do that, they have never done that."
As mentioned, you answered the question yourself, with your own research. They will be farmable sometime between today and the week of 5/23.
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