Konjeezy

Hi there I just modded my extra switch to transfer saves between. So a little new to the modded switch. I was able to extract the save, load it into pkhex but having a little trouble in pkhex to understand how to active oaks letter event. I originally got members card when the event officially came out.

How would I go about doing this? I saw an event tab, do I just go under the event listed shaymin? Do I need to add in also oaks letter in items? Or should oak himself give me the letter