diff --git a/service b/service
index 6c0ebe0..aa46710 100755
--- a/service
+++ b/service
@@ -98,7 +98,7 @@ def main():
                 # we need.
             else:
                 schedule = r.json()
-                schedule["tracks"] = []
+                tracks = {}
                 for talk in schedule["talks"]:
                     talk["start_str"] = (
                         datetime.fromtimestamp(talk["start_ts"])
@@ -106,6 +106,17 @@ def main():
                         .astimezone(event_tz)
                         .strftime("%H:%M")
                     )
+                    if talk["track"]:
+                        if talk["track"]["name"] not in tracks:
+                            tracks[talk["track"]["name"]] = talk["track"]["color"]
+                schedule["tracks"] = []
+                for name, color in sorted(tracks.items()):
+                    schedule["tracks"].append(
+                        {
+                            "name": name,
+                            "color": color,
+                        }
+                    )
                 node.write_json("schedule.json", schedule)
                 log("updated schedule json")
         elif config["json_flavour"] == "voc-schema":