Hi,
@Garrett Oreilly. At the risk of sounding like The Old Man of GTD (I'm only 48, and I'm certainly not the most experienced person in the world at GTD, nor the wisest) I've struggled with this exact question. On the one hand, I've learned from experience that if I clutter my calendar with items that are not hard landscape, it does indeed lead to the negative consequences David Allen warns about (wasting time editing your calendar, and more important undermining your trust in your system and yourself).
On the other hand, I've learned that answering the question "what would just die if doesn't happen at this time or some time today" is subjective. It depends on your values.
In the abstract, you could miss all manner of deadlines and still not have those things "just die." You could get a report to your boss later than agreed because he or she might not fire you on the spot but simply have a lower opinion of your value as an employee. Maybe some people are OK with that. I wouldn't be, but other people might have different values.
Or how about filing a tax return in the U.S.? For most of us, the deadline for filing a personal tax return is April 15 of each year. But you *can* file your taxes late. Some people go for years before filing tax returns (I did tax preparation for a couple of years; trust me, I've seen this firsthand). There are financial consequences for ignoring this deadline and therefore I haven't and would not file my taxes late by choice, but not everyone shares my values.
So... do certain cleaning tasks belong on your calendar or would they dilute your view of your hard landscape? It depends on your values. If not doing these cleaning tasks would make you feel so uncomfortable about having people over that it would be a negative experience for you, schedule them either as blocks of time or as day-specific items on your calendar. There's no harm in that.
If based on your values these tasks are "nice-to-do" on the day of your D&D evenings, you could create a checklist instead. I bet seeing "D&D night" on your calendar will trigger you to review the checklist and decide what cleaning to do that day.
Or if you're using a software tool that supports deferred actions you could follow
@mcogilvie's suggestion.
So there's lots of ways you could do it. And the cool thing is that you get to let your values be your guide as to what "would just die" and is therefore hard landscape, and what's "good to do if I have time."
I hope that helps. In the meantime this not-old-man needs to go yell at some kids to get off his lawn.