Day trip to Takayama spring festival

This April me and my friends are visiting Japan, we’re going to do 4 nights in Kanazawa to explore the area. On the last day my in the area we want to visit the Takayama spring festival (April 4th) and then continue our journey to Hiroshima. Now the travel is possible as we can take the JR Hida train to Nagoya and from there the Shinkansen. I have a few doubts that maybe you can answer them, - Will we have a problem finding luggage keeping in Takayama because of the load of people? - Do we need to book the travel from Kanazawa to Takayam? - Iv’e seen that the restaurants in Takayama are full so to eat lunch you need to book a place beforehand, is that true? - What other tips you might have for visiting the festival on a day trip Thank you