added August 9, 2014: I guess Drupal updates the monthly archive on its own periodically, so the post indeed showed up in the monthly archive eventually. Now, I've re-dated it (a significant portion of a year earlier, because I was mixed up about which of our trips together to San Francisco it talked about.
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I noticed tonight that I had an unpublished entry from 2010 where I talked about our trip to San Francisco that year. It probably wasn't done yet (thus why it wasn't published), but I can't finish it now, and I wanted to make it visible. I haven't figured out yet how to make it show up in the archive list yet, but here's a link to it.