There are lots of ways you can participate!
Have your own signing event. This works well with groups big and small.
For a small signing take a bucket of baseballs to a Boy and Girl Scout Troop meeting, a church or temple youth group event, a school class or a sports team.
You can drop a bucket of baseballs off with your local Firefighters or Police. Many of them will be former military and will be very happy to participate.
Bring baseballs to a family event: A holiday dinner, a birthday party, a graduation celebration, a Bar Mitzvah or even a family reunion.
Reseach your local area for the VFW’s, Knights of Columbus, and military family run organizations. So many of them are out there and look for items like baseballs to send to the troops. They are always willing to lend a hand – and sometimes have the means to help purchase baseballs, pay for shipping or have a contact in the armed forces that you can send the baseballs to once they are ready to go.