Disclosed are computer implemented methods, systems, and non-transitory media for representing a plurality of time-bounded events in first and second grids. The first grid has a larger size than the second grid. The second grid represents a second set of time-bounded events in the plurality of time-bounded events. A user-movable window is presented at a first position within the second grid where it encompasses a first portion of the second grid. The time-bounded events in the first portion of the second grid are displayed as a first set of time-bounded events in the first grid. Responsive to user instructions to move a position of the window from the first position to a second position within the second grid, the window is moved to the second position where it encompasses a third set of time-bounded events. Further, the first grid is updated to display the third set of time-bounded events.