I'm surprised to hear that, to be real honest. Since you are one of PC's famous brand, you should have no problems on promoting the event (easier than promoting/managing a club).
Assuming you decided to create 'Blaine's Weekly Quiz', make sure to ask Syd/Janna(?) if you are allowed to create a simple event, well I''m sure you knew that part already, haha. Second, innovative and fun, you gotta study the Gen III games as well as think thoroughly, for example, 'Why is it impossible to evolve Chansey and Golbat in FRLG? Make a theory.', 'What impact would it bring if Gen I evolution forms like Tangrowth, Electivire, Sylveon existed in FRLG?', etc. Third have fun and do not stress yourself and set a due date for the event. :)
I know you can do it, so believe in yourself! Bring your funny side too, people will appreciate that a lot!