I'm not sure whether I would call an activity post, but here's an update:
My opponent
NimoNimal set a date and time for us to battle (which is August 6, 8:00 pm GMT -5), and I agreed. However, I've been waiting for roughly two hours and he wasn't logged on.
However, he told me that he prefers to play on the 7th, which is after the deadline; he didn't mention any time that would be ideal for us to battle.