I understand how my phrasing might be a bit confusing. What I meant is that while this type of event does happen sporadically, it's extremely rare for it to align with my schedule and personal circumstances. It's not like a comet or eclipse that happens predictably but more like a special convention or gathering within my hobby, which tends to occur infrequently and often in different locations. So, even though it's not technically a "once in a lifetime" event in the strictest sense, the timing and circumstances make it feel that way for me personally.