diff --git a/seminar.md b/seminar.md
index c658b34d27b12ae51f46be6ccb3b5978e5b4e7a6..23c1b63fd680efec3aa03e367d963eaf1105ec59 100644
--- a/seminar.md
+++ b/seminar.md
@@ -3,16 +3,21 @@ layout: page
 title: SIGMathLing - Seminar
 ---
 
+<!--
 **NOTE: Time zone changes**
 *From March 29, we will shift the meeting from 14:00 UTC to 13:00 UTC.
 If you live in the Northern hemisphere and switch to daylight saving time, it should be the same local time as it used to.
 Note that some countries may switch a few weeks earlier or later.
 The shift makes it more convenient for our Japanese attendees.*
+-->
 
+**NOTE: Reduced Meeting Frequency**
+*As we have discussed in the last meeting, we will change the schedule and meet only every
+four weeks for now.*
 
 
 
-The SIGMathLing seminar is a bi-weekly (i.e. every two weeks) seminar on mathematical language.
+The SIGMathLing seminar is a seminar on mathematical language that currently occurs every four weeks.
 It is intended as a forum for reporting on results and new developments and discussing them with fellow enthusiasts.
 
 The seminar is open to anyone. If you are interested, just join the meeting. No registration etc. required.
@@ -55,9 +60,10 @@ and a mattermost channel for chat. To join the mattermost channel:
 |2021-03-15| Peter Koepke | Isabelle/Naproche |
 |2021-03-29| André Greiner-Petter | Comparative Verification of Digital Mathematical Libraries and Computer Algebra Systems ([slides](https://gist.github.com/AndreG-P/4fdbd42f313d112c888c10c2136a3620)) |
 |2021-04-12| Deyan Ginev | Scientific Statement Classification over arXiv.org ([slides](https://prodg.org/talks/scientific_statement_classification#1)) |
-|2021-04-26| ? | ? |
+<!-- |2021-04-26| ? | ? | -->
 |2021-05-10| ? | ? |
-|2021-05-24| ? | May be cancelled (public holiday after pentecoast at least in Germany) |
+<!-- |2021-05-24| ? | May be cancelled (public holiday after pentecoast at least in Germany) | -->
 |2021-06-07| ? | ? |
+|2021-07-05| ? | ? |