Dedicate a sports event or match to them.

Hold a candlelight vigil.

Create a scholarship for students in their field.

Visit a museum or exhibition they would have loved.

Create a life story book.

Commission a stained glass window in their honor.

Start a tradition of sharing memories on their birthday.

Wear their favorite color on special days.

Participate in an event or cause they supported.

Create a memorial website or blog.