What will happen if you complete a stamp card in Splatoon 2?

Question

Within the local play area called the shoal in Splatoon 2, you can play with local players.

I have seen a stamp card where you can collect stamps on but

How to collect them and what will happen if you complete a stamp card?

I can't find this anywhere and I don't know why it is there at all.

Answer 1

If you complete a stamp card, you will get a Crust Bucket ticket.
^{Source(but the source is written in Japanese)}