When applying for or attending a theatre casting, actors should keep a few key things in mind:

1. Preparation is Key: Thoroughly prepare your monologue, song, or scene, depending on the casting requirements. Practice and be ready to perform your best.
2. Research the Production: Familiarize yourself with the play or musical being cast. Understand the characters, storyline, and the director’s vision for the production.
3. Professionalism: Present yourself professionally. Arrive on time, be courteous to staff, and come dressed appropriately for the role or in neutral audition attire.
4. Be Flexible: Be open to direction and adjustments during the audition. Directors may want to see how adaptable you are to their vision.
5. Confidence: Exude confidence in your performance. Even if you make a mistake, continue without breaking character.
6. Headshot and Resume: Bring a headshot and a well-organized resume detailing your acting experience and training.
7. Stay Positive: Rejection is part of the industry. Don’t be discouraged by audition outcomes. Use each experience as an opportunity to learn and grow.
8. Networking: Build relationships with directors, casting agents, and fellow actors. Networking can lead to future opportunities.
9. Follow-Up: If you’re interested in a role, send a thank-you note or email after the audition to express your continued interest and appreciation.
10. Be Yourself: Don’t try to be someone you’re not. Casting directors appreciate authenticity. Show your unique qualities and what makes you a great fit for the role.

Remember that each casting is a chance to showcase your talent, and with persistence and dedication, you can achieve success in the theatre industry.