Some features are always present and are indisputable mappable - like buildings.
Some features are seasonal but are easily verifiable all the time as they merely change the form. For example an intermittent river - riverbed is always there, nearly always with obvious indications that water flowed there some time ago. There are features that obviously should not be mapped - with objects like vehicles in motion being the extreme example. Other obvious examples are events - OpenStreetMap is not a place to map events that happened in the past or will likely happen in the future. One may still map memorial plaques or monuments or football stadiums, but OSM is not place to mark for examples places of famous robberies or crash sites of aircraft or planned locations and dates of matches of a soccer tournament. But there are also features that are possible to survey only during specific circumstances and unverifiable otherwise. For example shops in a mall building closed during night - verifiable only during opening hours, with building interior inaccessible otherwise. Other example is a shop without sign, or with movable sign placed on a sidewalk during opening hours - such building may be after closing indistinguishable from residential building with a garage or a vacant shop with type of the shop nearly impossible to guess. Or a street vendor - somebody may be regularly at given location within his/her opening hours, after that time such place would be indistinguishable from any other party of the street. Or movable loungers, present at the same location each spring, summer and autumn, removed for winter. Or a flea market present on each Tuesday, regular street otherwise (maybe with some street markings). I think that all cases like that may be mapped, and I plan to amend "Good practice" wiki page to explicitly allow features that are reoccurring and to explain that they are not included into "temporary features" that are not supposed to be mapped. This discussion was started as result of https://wiki.openstreetmap.org/wiki/Talk:Good_practice#temporary_events_and_temporary_features_clarification <https://wiki.openstreetmap.org/wiki/Talk:Good_practice#temporary_events_and_temporary_features_clarification>on request of SelfishSeahorse
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