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One way to do something like that might be the memory palace technique along with the story method or link system. Each person could go in one location of a memory palace, and then facts about the person could be chained together.
Another way to store the facts would be to zoom in on each location and create a nested memory journey there.
Example: if a location for one person is a small table, you could create a mini-journey on that table just for the facts about that person. If the person is Albert Einstein, and the table is his location in the main memory palace, then one corner of the table might contain a mnemonic image with his birthday; another corner might contain an image that represents the year 1905 (when he published famous papers); and another corner might contain the titles of those papers.
(If you want examples that are more specific, post sample data for a few people.)
See this thread for some ideas: Gavino's Massive Memory Palace System
Also check out the resources on the how to learn memory techniques page. There is a free ebook that provides a quick introduction to the techniques.
There’s also a page on how to memorize numbers that might be useful for remembering dates.