There are many ways to observe any of these days.
On World Vegetarian Day and World Day for Farm animals, one can prevent themselves from consumption of meats in honor of the short and miserable lives of millions of animals which end at the horrifying slaughterhouses. One can make a donation to an animal shelter. One can treat the neighbor’s dog that is always tied to the fence to a long walk and play time in the yard.
What are you going to do on this day?