"‘Ladies and gentlemen, let the twenty-ninth Hunger Games begin!" Booms the voice of the announcer, Didius Templesmith.’"
-Phox Yule talking about Didius in 29 ADD in "The 29th Hunger Games"
He is heard announcing the commence. When Wolfmark becomes a victor, he is about to announce his victory but vomits mid sentence after seeing how the D4 Male died.
This year, he is mentioned to be the announcer. He is heard when the tributes went in their glass tubes, and when Magnus won his Games, announcing his victory.
During this time, he is seen talking on the news multiple times, and is seen spectating during the Games, along with Gaius.
During the 29th Games he is heard announcing the commencement of the Games.