According to this short article in the December 9, 1949, edition of the Long Beach Press-Telegram, Long Beach, CA, this was a 15-minute program to be broadcast the following Monday, December 12th.
A check of the same newspaper’s Sunday edition showed that the program was set to air on KFOX at 11:45 a.m.
According to many other newspaper articles, this was the beginning of “Bill of Rights” week and there were many and varied activities planned, so this would fit right in with all those other projects.
Unfortunately, the program is not available, so whatever Stewart’s involvement may have been is not known.