I have an important day coming up and <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says it will be the 2nd day of my period. I normally have very clear skin but a few days before my period I break out like crazy and it doesn’t go away until a few days after my period. I can’t have acne on this day, so what do I do? Need some tips. What’s your technique to prevent hormonal acne? (I don’t wear makeup so preferably something not involving covering it up)

EDIT: The event is in about 3 weeks.