I need students to be able to sign up for one of two field trips. It needs to allow students to sign up only once and limit the number of students who can sign up for each date. Is there a way to create such a sign-up sheet? I could do this with a doodle poll, but Canvas flags the poll as an insecure site that most Canvas users won't be able to access. I could do this with a Google form, but then people have to open a Google account to sign up. Is there a way to do this simply in Canvas?