I was so confused about the whole plot reset thing at first, since even with following a guide and a friend on hand to give me pointers, I couldn't seem to get it to work. I'd set the clock on my Mayor file to 5:58AM the following day and log out, then make a new character and look for the plot. But I couldn't find one and it was frustrating me.
So the thing I realized was, it never works with the first character that I make to run around, apparently because 6:01 or 6:02 is not early enough for the plot to actually be set out yet. I discovered on my next try that I found it just fine, having made the character technically after 6:05AM. So it never works on the first try for me. I have to make a new character, quit, make a new character again and THEN the plot shows up.
Did anyone else have that issue with plot resetting? I suppose I could just take longer talking to Rover, though the one time I attempted that, it still didn't work out on the first try. It always takes until the second attempt at making the new character for the new plot to exist in my town for some reason.