When does the Reading Drive shop close? I doubt it stays open endlessly after the drive, I am just curious how long we have to purchase items there.

I'm pretty sure it will stay open forever; and your points that weren't spent get shifted over to the next Reading Drive.

Hm... I figured as much. At least, I figured it would stay open until the following Reading Drive, close for the time it was running, and then reopen for the rest of the year.