Taylor Herring replaces seven-year incumbent agency Paget Baker.
The festival is an annual summer event held in August for TV industry delegates.
The agency's brief is to raise the profile of the main festival and drive uptake of its two schemes - TVYP and Fast Track - aimed at giving industry access to young people of all backgrounds.
Festival director Amy Brown said: 'This year we made the decision to bring together the PR for the festival and our youth initiative, The Network. So it was a good opportunity to take a fresh look at who would be handling our PR.'