I missed Senior Citizen Day this year but WATE in Knoxville did not.
You can read their article here: Senior Citizen Day: 6 ways to celebrate
WATE suggested that we can celebrate Senior Citizens in a variety of ways. Even a simple phone call to a lonely elderly person -- especially one without access to social media -- can brighten that person's day. And you don't have to wait until next Senior Citizen Day to make a call.