Is a Common App Activities Update Necessary?

Hello! I recently finished applying to all my EA schools, and am now beginning to send out RD applications. On my Common App Activities Section, I included a competition I’ve been heavily involved in. I wrote that I am currently a semifinalist competing to attend internationals. If, after sending out my applications, I find out that I didn’t progress to internationals, would I need to update the colleges I applied to? Thanks so much!

No. Nor would you need to update if you did progress. Most applicants will have new honors/awards, and AOs know that, but do not need a running commentary of every change.