<p>Well it’s the same thing as this. It’s just referring to which yearly event (the antecedent for this). You have to have a noun after this (in this case) and they didn’t repeat a single word. If they’d put “annual” instead of yearly then it might be redundant, but it’s still grammatically correct so whatever. I’ve done 2 SATs and very rarely have I come across a redundancy question that wasn’t explicitly obvious (never came actually). I wouldn’t worry about this one, especially as its coming from PR. Redundancy is generally not an issue ever unless you repeat a noun instead of a pronoun or something like that.</p>