The location of the object is it a condition that the object exists in. A meeting, on the other hand, is defined by its location. If there is no location, there is no meeting. Nationality, composition, profession, gender, race, color, and personality traits all define who or what something or someone is. They are characteristics.
Time is self defining.
Mood and anything else that is not a defining characteristic is a condition. Preterite v. imperfect Preterite and imperfect are not as cut and dried as some of the other choices you might have to make. Generally, preterite is more defined in time than imperfect, and generally refers to a specific incident or moment in time. Imperfect, on the other hand, is less specific and usually refers to something that happened many times or is difficult to encapsulate to a specific time period. The imperfect tense, therefore, is often used to set a background for another action.