Look in any magazine, vintage or modern, and you'll find a common theme running throughout, being anniversaries and seasonal articles and snippets. The need for such contributions by millions of publications all over the world is so intense that many writers earn their entire income writing about things that happened one hundred or so years ago, people (living and dead) who are celebrating an important milestone (birthdays, deaths, marriages, etc.), or relating to regular events like Christmas, Bonfire Night, Easter, and so on.
All you have to do is find relevant information from the public domain which can be converted to modern day terminology which you then use as the basis for paid letters to the editor, alongside articles, captioned photographs, recipes and poems attracting valuable gifts.
Or you could produce a range of birthday cards or scrolls containing information to interest people born in a particular year or sharing the same star sign. Add lucky dates and numbers, main events at the time the individual was born, famous and infamous people sharing the same birthday or star sign, and so on. Then sell your products on eBay, Amazon, Etsy and numerous other sites.