Why pair partying with toil?

Infinite Jest's chapters vary wildly in length. Actually, before I even get into that, chapters in Infinite Jest aren't numbered or named, but instead are set off by specific (or non specific) dates.

The chronology jumps around a little bit, but I haven't been paying strict attention to it and the plot hasn't suffered at all for it. Perhaps Wallace inadvertently commented on this quality of his novel when he pointed out that Mario's puppet show movie about the dawn of Interdependence got some of its chronology wrong, but was on the whole more entertaining than the longer, more chronologically accurate ONANtiad of his father, the Mad Stork, J. Incandenza.

Anyway, Infinite Jest's chapters vary wildly in length. The longer ones tend to be broken down into sections, but these sections aren't always sequences. In the most recent chapter (about Mario's puppet show movie, Don Gately, and the maniacal Eric Clipperton) its different sections don't jump around in chronology (directly) but instead in focus. Actually, except for the one about Gately and his job cleaning up the hellish mess left everyday at a men's homeless shelter, every section of this chapter is focused on the evening festivities at ETA.

The Eric Clipperton parts, though obviously from years (months?) before, are after all nonetheless part of an elaborate flashback meant to explain a single reference to the suicidal tennis player made in Mario's puppet show movie.

So back to the bit about Don Gately and his janitorial duties. Why is it paired with the festivities at ETA, specifically an account of the dietary rules-free feast and accompanying film? Gately's duties happen in the morning, so they could be hinting at the aftermath of Interdependence Day celebrations, but that would be too easy.

They could also be paired up simply because Ennet House (of which Gately is a resident) is mentioned when the narrator notes that an Ennet House resident was manning the ETA gate when Clipperton showed up one early morning.

This would make some sense, as it fits in with the book's sense of the narrator's being constantly reminded of other, marginally related details, by all of the details that he/she is spouting for the sake of hyperrealism.

But is all of this extra detail meant to make sense? Are all of the sections even narrated by the same person, or is this book just a collection of accounts edited into one two-brick-sized tome?

As of yet, the bricks have said nothing on that.