Ideas for four days off with the Autumn equinox

I'm a Tokyo resident and I already checked/posted in the Tokyo events general (but as is often the case with general threads, it's pretty much dead.)

Will there be any Autumn themed events this week or next leading up to the Autumn Equinox on Tuesday? If not, what could be a good way to celebrate it? Also, what do Japanese people usually do since many will have four days off.

I want to bring a date somewhere in Tokyo although I don't want to make it something that's over several days so just during the day or night is fine.