The adjective art festival had better be an idiom.

Idioms describing art festivals are as follows:

1, let a hundred flowers blossom, describing that a hundred flowers blossom and are colorful, different forms and styles of art develop freely, and the art world is prosperous;

2, bright colors, describing beautiful scenes and things in front of you;

3. Ingenuity refers to the unique ingenious conception in skill and art;

4, colorful, colorful, metaphor for outstanding achievements or performance;

5, wonderful, described as extremely beautiful, unique and unparalleled.