For your one-stop shopping, you can find everything you need to teach a lesson or a unit about veterans and veterans day in this booklet by Scholastic, Inc. It includes links, activity ideas, and some activity pages for younger students.
The history of "Taps" is explained in great detail in this article. "Taps" is deeply ensconced in the traditions of Veterans Day and an important part of military life. Let your students explore the history and take a look at the sample lyrics that have been written over the years. Then, see if your students can come up with their own lyrics for Veterans Day.
After reading and discussing the poem, your students might like to make poppies out of red crepe paper following the directions found here. Maybe you could find a local veterans group where you could take the poppies.
Your students will enjoy this short, two-minute video explaining the history of Veterans Day. The page also includes other facts and information about Veterans Day and veterans. You can even find other videos about veterans to share with your classes.