Should I go to this Disney Channel open call?

No, you can't attend since you're 18. They are not looking for people who can pass for 15. They are looking for kids who ARE 15. And lying to someone - an agent, producer, whoever - is NOT a good way to approach an acting career. Generally speaking, people are not interested in working with others who are dishonest.

You have to understand that Disney open calls are not for a specific role or anything. No one goes from an open call to a Disney show. This is just a networking opportunity for CHILD actors. (At 18 - you're an adult actor.) It could take YEARS for anyone who catches the interest of a casting director here to actually make it on a Disney show or any show.

Professional acting is a business. Actors (even Disney actors) are not just "discovered". It's like starting a company and you are the product that has to be marketed and sold. If you're interested in an acting career - then you can do that. There are often calls for actors who are "18 to play younger". But this is not one of them.

Sorry.

No harm in turning up for the open call. As you guess, the film company is interested in the look, not the documentation.

if you can pass for the age they want, go on it, but no one has ever been picked for anything on

these kind of things