Wait, why does it matter when the pictures were taken or when the flowers bloomed? I think we're complicating a very simple thing here. It's not a contest for who has the best flowers or photos that week, it's a celebration! Calendar year doesn't matter.
Just say "anyone who grew daylilies in the last year may post their pictures for Daylilies Week" in July - why not? That way Gleni in Australia can post his gorgeous daylilies that are in bloom now, right alongside the ones that bloomed in my garden in April, and those reblooming last fall in California.
