diff --git a/schedule.md b/schedule.md
index 1a0c2092c1cc54ba4d52ad752a1b8b21a9b6dc33..1091094fa89ff0de94fa7de35cc070148106f8e7 100644
--- a/schedule.md
+++ b/schedule.md
@@ -94,10 +94,10 @@ Presentations from [2017](schedule_2017.md).
   - JOSS (Jeroen).
 
 - December 17:
-  - Slack alternatives (discussion).
+  - ~~Slack alternatives (discussion).~~ (Postponed due to lack of participants)
 
 - January 7:
-  - ?
+  - Slack alternatives (discussion).
 
 - January 14:
   - Education portfolio.