This may be a matter of personal or regional usage, but I'd say "historic places" but "historical festivals."
The reason is that the places have a history, but the festivals are about history. The festivals themselves are, in most cases, recent. They don't have much history of their own. If there is a festival somewhere that's been celebrated since 1215 A.D. or sometime like that, it would be a historic festival, but I don't know of any.
Also, there seem to be words missing in your sentence. It should be "... in reviving the traditions that a country has," or something like that. I'd probably say "... in reviving a country's traditions," but that's a matter of style.
