The “yearly tradition” here is the annual pardoning of a turkey by the U.S. President just before Thanksgiving. Each of the answers contains the name of one of the turkeys so pardoned (yes, they do have names!). Arranging the answers in chronological order by year of pardoning, we get:
|2002||KATIE BAR THE DOOR|
|2005||STAY PUFT MARSHMALLOW MAN|
|2007||MAY THE FORCE BE WITH YOU|
|2009||PROFILES IN COURAGE|
|2016||TATER DU LIGHTHOUSE|
Solvers need to identify the presidents at the bottom; these are used to index into the 10 answers by their president number (so for example, Thomas Jefferson in the first column indicates the third letter in answer one, T, since he was the third president). Extracting letters in this fashion for all 30 images yields:
This gives the meta solution THEY USE GEORGE WASHINGTON'S CARVER.