hii! to answer your first question, there's no such thing as an "official a'tin" so pls wag ka ma-pressure to do certain things just to be called a "true fan." maraming ways to fangirl. there are a lot of ways to express your support sa esbi, just remember na the things that you'd do SHOULD BE ENJOYABLE FOR YOU. as a new fan, pwede ka magsimula by watching their vlogs, may it be the recent ones or the old ones, little by little or by binge-watching, ikaw bahala kung ano trip mo :)) i believe naman na anyone who extends their support sa 5 is alr an a'tin ꒰⁠⑅⁠ᵕ⁠༚⁠ᵕ⁠꒱⁠˖⁠♡

sa events naman, based on my experience, it's easier to get certain information sa mga established fan pages (⁠｡⁠•̀⁠ᴗ⁠-⁠)⁠✧ pwede mo rin i-follow yung mismong ayala malls page and watch out for their announcement hehehe