According to the website Days of the Year, Old Rock Day is a day that Geologists and amateur rock enthusiasts take it upon themselves to show their appreciation of all things fossilised and stony.
Collect Rocks
Take a winter hike and find your favorite rocks, or observe natural rock formations in your area.
Paint Rocks
This has been all the rage near us in the last year. People have been painting rocks and then leaving them around town in parks, on sidewalks, etc., for the purpose of brightening someone’s day. It’s also fun to paint rocks and give them as gifts as paper weights, or to keep as a “Pet Rock”.
Learn about Rocks & Fossils
Visit a geology museum and learn more about different types of rocks and fossils.
Here are some websites to get you started!
https://kidsloverocks.com/fields-of-study/