Hi! I have a small question; is it allowed to wear other con(non-EF) badges or it's prohibited?
None EF badges yes, but please do NOT wear red or orange lanyards, regardless of their labeling/print/pattern. This way you help us to speed up entry checks and avoid misunderstandings. Also please make sure that your official con badge is on display at all times. That also avoids checks by security if they can't see your badge - a process that annoys both sides. :3
Thank you for your consideration!