As requestetd, here's a repost this bread of a graphic showing the connections (with small clarifications on the graphic and the text here)
POTUS had a "OTR" trip after his return from Iraq, listed that way on schedule
POTUS_Schedule posted a follow-up explaining what OTR means (Off The Record travel - no fanfare), with a link to an example YouTube video showing an OTR motorcade
Video showed POTUS motorcade on afternoon of Oct 28, 2017
Exact time of the video was only 29 minutes before Q 1 was posted
The current post on POTUS_Schedule pointing (now) to POTUS activities on that specific date and time (when Q 1 was posted) is an interesting coincidence
While the POTUS_Schedule post was informative about OTR, there is no obvious reason why it was necessary to post such an illustrative video at all, when a written description would have sufficed (increasing the change that the video is a clue)
Suggests we may want to look at POTUS activities that afternoon. Or since we know POTUS = Q+ and POTUS_Schedule is telling us that POTUS was in a slow motorcade at that time, maybe it's a hint that POTUS posted Q 1 on that drive?