Heading to bed p. soon, hence my comment here rather than Deescord, but as far as date logistics go, with all the empire stuff, I wonder if making it before the empire trip would be more seamless/convenient, since she did invite him over to her place for the cooking antics. I'd totally be down for a log set before the event if that works for you!

Though Doom informed me that Frisk may actually try to sneak after Pap and snoop on the date, which... could be potentially very awkward and/or hilarious. Pap still has no idea that Frisk is skeptical, and I've got no idea if she'd bring that up beforehand.