I started collecting souvenir guides for Ultimate Fighting Championship events back when I first started covering them professionally.
It was not a conscious decision. Not at the beginning. The public-relations team always handed them out to those of us in the media center or put them in a stack for us to grab. I packed them away, took them home and put them in a stack on my office bookshelf.
Over time, that stack became larger, and it turned into something meaningful. As it grew higher, I would occasionally return to them, leafing through the pages and remembering things that happened in those specific events.
They were a trigger for walks down memory lane. I have not attended every single UFC event over the past six or so years as part of my job, but I have attended many of them, and I have many memories.