diff --git a/res/mappings.35c3.json b/res/mappings.35c3.json
index c652c39b..0b68d5fb 100644
--- a/res/mappings.35c3.json
+++ b/res/mappings.35c3.json
@@ -21,7 +21,7 @@
   "Chaos West Stage": "chaos-west-stage",
   "Compeiler": null,
   "Discodrama": null,
-  "Kidspace": null,
+  "Kidspace": "kidspace",
   "Lecture room 11": "self-organized-sessions-11",
   "Lecture room M1": "self-organized-sessions-m1",
   "Lecture room M2": "self-organized-sessions-m2",
@@ -37,10 +37,10 @@
   "OIO Workshop-Domo": "oio-workshop-dome",
   "Seminar room 13": "self-organized-sessions-13",
   "Seminar room 14-15": "self-organized-sessions-14-15",
-  "Sendetisch": null,
-  "Shutter Island": null,
+  "Sendetisch": "sendetisch",
+  "Shutter Island": "shutter-island",
   "Vintage Computing Cluster": "vintage-computing",
   "WikiPakaWG Esszimmer": "wikipaka-dining",
   "WikiPakaWG Küche": "wikipaka-kitchen",
-  "Uptime Bar": null
+  "Uptime Bar": "uptime-bar"
 }