Class E7 Activity is used here to model an exhibition or a traveling exhibition. The scope note for E7 Activity implies a finite time-span during which the activity is taking place. Participating in an activity in a physical sense indeed has a finite time-span. However, the scope note does not take into account the alternative view that the experience of the event continues to develop by the participants and it becomes individualised after the physical interaction has concluded. In that sense the scope note is limited to the activity as physical presence when the experience of the interaction has multiple dimensions beyond that physicality. The class E7 Activity may not be adequate to capture the multiple dimensions of an exhibition. The scope note of E7 Activity states that the activity needs to be documented therefore potentially excluding undocumented exhibitions including some cases of art by racialized artists or artists of colour, where the type of exhibitions is known but not the exhibitions themselves or artworks by Tino Sehgal whose performance works are purposefully undocumented. The WPC database uses the Gregorian calendar to show dates. The CIDOC CRM does not define the type of calendar or time-representation that should be used to describe when the activity took place. Such limitations are imposed by the underlying software used to implement the WPC database. As such the implementation of time-spans on the WPC database is biased.