It is amazing the kinds of content you can dream up when you have a form to fill out. Attached for you today is a 12 month template to help you think about the kinds of content prompts you have.
Some Ideas to start with
A Day in History
National Day of ... Today happens to be national repeat day.
Get as creative as you can. Once you have your prompts start creating content, blog posts, ideas for infographics ahead of time. This makes your social media exciting and thoughtful.
Bonus, if you want a high resolution big copy, let me know and I can send you a printable file for poster sized prints. firstname.lastname@example.org