[Death by Mirrors]

Originally Posted by Gogandantes

so I just page surf & I find these is that how this works??

Food Fight only ran until November 30th, 2018.
You can't find any more food fight items, but presumably some users have extras to spare. Back during that event people would randomly have a pie appear on their screen while browsing Trisphee and get an item when they clicked on it.

As for the Bird Birth Bash going on now, you have a certain chance to receive a Birdday Box with each post. What item you get from it is random, but there's always the option to trade with other users if you have your eyes set on a particular item.