Effectiveness of recalling information in the same location it was learned In an interview with Robert A. Bjork this article claims that it is easier to recall information where it occurred:


  Similarly, studying in only one location is great as long as you’ll only be required to recall the information in the same location. If you want information to be accessible outside your dorm room, or office, or nook on the second floor of the library, Bjork recommends varying your study location. And again, these tips generalize.


How much of an effect does this have with:


Memorizing random facts
Recalling the details of an event that occurred at the location
According to the tradition expressed in a well documented (references at the end) popular science book about memory, Moonwalking with Einstein in which the author trains himself from zero to become the American memory champion, the memory palace technique (also known as the method of loci where loci is place in latin) is the one used by most competitive memory practitioners. It consists in recalling random facts (your question 1) by staging them into an imaginary location. Other aspects of the technique involve imagining an actor or agent in these places, but this element is used as a reminder for the type of information involved: the place itself is the key to memorising. Therefore the answer to question 2 is that details of an event are much easier to remember at the location where they occurred, when recalling this location.