diff --git a/seminar.md b/seminar.md
index 9794dde509f683f33a76d7a138d46f7a86b8650c..4bfac49fc9272400aded27383cbf975953d07a28 100644
--- a/seminar.md
+++ b/seminar.md
@@ -35,9 +35,9 @@ and a mattermost channel for chat. To join the mattermost channel:
 |2021-01-04| - | cancelled (too close to New Year) |
 |2021-01-18| Jan Frederik Schaefer | A Symbolic Framework for Mathematical Language Understanding ([slides](https://github.com/jfschaefer/slides/blob/master/2021/sigmathling/slides.pdf)) |
 |2021-02-01| Takuto Asakura | Towards Grounding of Formulae ([slides](https://drive.google.com/file/d/1JxNKW5M0KKYeBeL6Umsg6ZKBNzdCV_DC/view)) |
-|2021-02-15| ? | ? |
+|2021-02-15| ? | cancelled |
 |2021-03-01| Bernhard Schröder | Something about proof structures? |
-|2021-03-15| Peter Köpke | Isabelle-Naproche |
+|2021-03-15| Peter Koepke | Isabelle-Naproche |
 |2021-03-29| ? | ? |