When one has 50 plus events it becomes useful to be able to tag and categorize the event to group these meaningfully. I would recommend tags and categories for events. Let me take an example. Independence movement of India: 50 plus events for now... Categories would be useful to group as follows by timeline: East India period, Post mutiny British rule, Civil Disobedience, World War II, etc. Tags would be useful to capture meta data like... Congress, Muslim league, INA, revolutionary, satyagraha, etc (these would allow for grouping across categories). Addition of of these two features would immensely enhance the value of histropedia to the reader. Future versions could use a combination of time scale, category and tags to short list events. (this would aid focused research and avoid clutter to and keep the timeline topical to the current interest of the reader)