Holidays or historic dates can not only inspire you with content ideas, they are often something your readers can relate to.
Of course, this need not (and should not) stop at Christmas, Easter, Valentine's Day and maybe the Oscar. Just about every day is a holiday somewhere or has been the reason for festive activities.
Many of the stories behind these holidays are very interesting in their own right, and you can possibly connect them to the core theme of your newsletter easily.

