What are possible ideas for fundraising for a school club?

My robotics club needs to fundraise about 15,000 (about ⅓ of that may be easy to get scholarships), and we need ideas as to how to fundraise all of that money.

We have previously successfully fundraised 3,000 on a dinner/auction fundraiser. We are planning to do that for this coming year again, but we dont know what else to do!

Also, we plan to have various sales at our schools, and we were thinking about making simple little keychains that are really cool to sell. And also small little art things… like..hard clay made keychains… but we dotn know what else we can do for this!!

ANY ideas will be greatly helpful!!!

Thanks!