bummer you cant make it... WHAT A STORY!
what's the restriction atm? I am not aware of any, depending on your status tho. See this FAQ on the HiveFest Support site about Covid Restrictions, especially the second paragraph on EU entry from non Schengen zone (like brazil) https://hivefest.freshdesk.com/support/solutions/articles/80001029295-covid-qr-health-pass-vaxx-mask-in-netherlands-tl-dr-no-requirements-