Let's, for this month, keep it as is. Multiple entries and photos can be fron any time period. I think the most important piece that I am looking for is participation. The last month's thread was awesome - with lots of photos and lots of participation.
I 100% agree with you though. Ideally, photos should be taken during the challenge period and it should be limited to one photograph going forward. Why don't we make that the target of the September challenge?