diff --git a/agenda/busy.py b/agenda/busy.py
index 81d43ea..711523a 100644
--- a/agenda/busy.py
+++ b/agenda/busy.py
@@ -21,6 +21,7 @@ def busy_event(e: Event) -> bool:
         "meetup",
         "party",
         "trip",
+        "hackathon",
     }:
         return False