It eventually became clear that we weren't going to complete the Utilitaire challenge to spec. So instead, I decided to let the challenge inspire me to add some truly wacky utilitarian rides to our list just for the heck of it. In addition to lots and lots and lots of daycare/work commutes, we completed the following "utilitarian" rides:
We visited a museum!
We (meaning I) completed some of our apartment move by bike!
We took our moving boxes (and other recycling) to the Transfer Station!
We attended a "community meeting" (in the form of a group bike ride that I organized) with other bikey parents and kids.
So even though we didn't meet the Utilitaire challenge, we had lots of fun trying.
Many thanks to Chasing Mailboxes for setting up the Utilitaire challenge, and congratulations to everyone who succeeded!