Hi, greetings
Which country's cultural festivals and culture tourism you want?
If you can do with india case study, we can write on a number of different ideas,
Some thought framework -
Kumbh mela (largest cultural festival in the world)
Cultural tourism to experience Diwali, Holi, etc
The tribal festivals, moving circuses,
Things like this.
If you like something on this line, i can share some prior work with you to establish credentials
rgds
Sid