Priklausomai nuo konteksto: jei jie šventę išgarsino, t.y., ji tapo garsi (gerai žinoma šalyje ir/arba už jos ribų), tuomet tinka Kristinos variantas, tik vietoj "famous" siūlyčiau "well known". Taigi, būtų: made the festival well known.

Tačiau jei šventę išgarsino tokiame kontekste, kad kažkas organizavo šventę, mažai kas apie ją žinojo, o X ją išgarsino, t.y., apie ją staiga sužinojo daug žmonių, tai siūlyčiau "spread the word". Taigi, būtų: "X" on their own innitiave have spread the word about "Y"

I would say this corresponds to the wide range of practical activities you mention - “rodė įvairias reklamas, skelbė informacija, rašė ir pan.”.


Also choose the appropriate tense form:

worked ... (in the past)
- or -
has worked ... (in the past, but also for a certain longer period of time)
- or -
has been working ... (in the past, for a certain period of time, and still does).


Examples:

(1)
“It’s always interesting to hear how people heard of an event that I have worked on the publicity for.”
http://ohlmanngroup.com/spread-the-word/


(2)
“A few years ago Joan worked on the publicity for the Woodstock Film Festival, which I run, and did a tremendous job.”
http://www.greycoreliteraryservices.com/About_joan.html


(3)
“This committee worked on the publicity for this event, and on the recruitment of corporate sponsors.”
https://iportfolio.curtin.edu.au/view/my_networks.cfm?user=1...


(4)
“[..] man with whom I had the great pleasure of working on the publicity for the London presentation of ‘How to Succeed in Business without Really Trying.’”
“Doris Day” by Eric Braun
Hachette UK, 2010.
(via Google Books) http://tinyurl.com/l9dldmf