Calendar added "Assignment" event and it isn't letting me delete them

Im using the calendar widget on my phone. You can add and delete events for the calendar like holidays or birthdays, but for no reason my calendar started adding its own events based on things happening in my school and it wont let me customize or delete them. Normal events show up as light blue, but these show up as dark brown. Is there a way to delete these events, or at least hide them from my calendar?

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/showthread.php?t=784360&goto=newpost
via IFTTT