Ah yeah, I tend to assume people either play everyday or TT back to do the days they missed.
On the last bit, when I tried to override a plot before (which would have been my 10th) I couldn't get either my camper at the time nor the villager in the other town to mention moving. And when I tried on my cycle town where the plot was my 9th villager I instead ended up with both villagers moving in.
I've yet to have it proven to me that you can override a plot, though I imagine it is possible otherwise there wouldn't be the system of cancelled move letter and Cheddarcat wouldn't have managed to glitch his town with a double Wolfgang invite.
So don't count on it always working. ~ I've not risked trying again since though.
Ah, good to know -- someone posted yesterday that it happened to them, but if you've actually experimented with it and it didn't work, it must not be consistent (or even common)... in any case, I definitely wouldn't count on it, but I think it's worth a stab if you have already logged on as your mayor or alt and saved the plot.