Visiting North Korea: I will accept reports corroborated by multiple reputable news organizations as sufficient proof. Feel free to ask if any scenarios feel ambiguous. [1]
Box office: I will use the "Domestic Opening" listed on BoxOfficeMojo, however it is defined. For a concrete example, the "Domestic Opening" for Barbie is listed as $162,022,044, and thus would have counted for resolution (>$140M).
Other details:
For context, AFAIK, typically that "Domestic Opening" number is the 3-day total (plus Thursday/other "previews") for North America (e.g. it wouldn't include a holiday Monday). But that's just my informal understanding, not a rule for resolution—I will use their "Domestic Opening", however they calculate it.
There is no obvious/strict end date here. If Putin dies, and is no longer able to visit North Korea, I can resolve the market as NO (as an event that cannot happen thus cannot happen "before" a different event) but this case is unlikely to matter.
If any aspects of the resolution criteria are unclear, please ask.
[1]. If it happens during 2024, I am likely to follow the resolution of this market: https://manifold.markets/HenriThunberg/will-vladimir-putin-visit-north-kor.