If I were to make a poster for a school event, for example, prom and I use a font, Is it considered personal use since I won't be making money of it? Thank you in advance

Like always, the best thing to do to be absolutely sure is to contact the author.
I'm pretty sure that the author will not be present at your even in a Philippines School. So, the risk is minimal...
Unless that is my font and I happen to be at that Philippines school.
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