capsule event

Hello!! Im very interested in the strange capsule game event as I recently had it occur on my farm for the first time, and very little information is available on it in the wiki/on reddit. I had the strange capsule appear on my farm in late summer year 2, and after waiting 3 days (like it says...

On the winter of the 6th year. During my 5th night in a row or so at the cabin on Ginger Island, I got the alien capsule event. I was told a strange noise was heard on the noise, and I returned to my farm to find the capsule there. Is this meant to happen while I'm away? I only bring it up...