diff --git a/agenda/conference.py b/agenda/conference.py
index 653caa2..3d96dbb 100644
--- a/agenda/conference.py
+++ b/agenda/conference.py
@@ -39,6 +39,7 @@ class Conference:
     hackathon: bool | None = None
     ticket_type: str | None = None
     attendees: int | None = None
+    hashtag: str | None = None
 
     @property
     def display_name(self) -> str: