This happens quite a bit. I would be at the Kingdumb Hell, wondering how I managed to get there despite my vow to never set foot in one of those places again, and then the hounders would start showing up so I would be committed to that one more boasting session. Sometimes I would find myself at a book study, which is about to start--once being asked to say the opening prayer (Dear Satan, please put unclean thoughts in these people's heads so they can sin and get disfellowshipped, and stumble as many as possible).
I have also seen a$$emblies this way. Those dreaded things are usually more disjointed, as often as not leading to an intermission or ending as I find my seat. Having a dream of an a$$embly where I actually hear a talk delivered in a format that is accurate (whether the talk itself is) is extremely rare. I might say, however, that once I was at the end of day 1 of the Grand Boasting Session and they kept the prayer rambling specifically because I needed to get the hell out of there quickly, and tried to prevent me from walking out during the prayer.
Usually, however, it reminds me of how I would dream of having about half of my Christmas decorations down, and be working on the other half when it would have been as easy to start from one end to the other and get them all in one go. When I was a witless, I used to dream of being in a place where I only half finished the removal of the decorations, with the other half being "to do".