National Historic Marker Day is observed on April 24 and aims to raise awareness about the importance of preserving historical markers, which number over 219,000 in the United States and thousands more in Canada. Founded by the William G. Pomeroy Foundation, this day encourages individuals and groups, including schools and civic organizations, to engage in activities such as field trips to local historical markers and cleanup efforts to maintain their integrity. Participants are advised to follow specific cleaning instructions, such as using mild soap and soft cloths to avoid damaging the markers. The inaugural celebration took place in 2021, highlighting the community's role in caring for these cultural artifacts, which serve as a tangible connection to local history.