I vote for either the 19th or 20th; I just need to know early enough in advance which so I can plan my weekend errands for the other day. For now, early morning Saturdays are going to be best for me, because there's 0 chance of me getting dragged along somewhere. I don't have anything crazy planned for the rest of May except Deadpool, which would probably be on a weekday anyway.
The 26th-28th is doableish but I have absolutely no guarantee of the integrity of my roleplay, as I'll have just gotten my wisdom tooth removed the Friday before, and don't wanna be either drugged up or just too in pain to pay attention. That's kind of a play it by ear situation.
By Monday, I'd probably be fine so long as I don't have to type with my face.
Note: the 28th is a holiday for British and Americans, it's just euro I'm not sure about.