Oops, sorry I misunderstood. I have not seen anything about an official general challenge for July.
You can always check in Challenge Central (in the Community tab above) for other ongoing challenges in case you might want to join one of them when there isn't a new monthly one like you are asking about.
Yes, there is a July challenge and it is posted on your Spark Activity Tracker details page. If you do not see it there, you may need to refresh the page and see if it displays then. Do you see it there now?
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