diff --git a/__pycache__/sanitize.cpython-311.pyc b/__pycache__/sanitize.cpython-311.pyc
new file mode 100644
index 0000000..5453e3c
Binary files /dev/null and b/__pycache__/sanitize.cpython-311.pyc differ
diff --git a/bot.py b/bot.py
index f22537f..0350b10 100644
--- a/bot.py
+++ b/bot.py
@@ -1,6 +1,7 @@
 import json
 import logging
 import os
+from sanitize import sanitize
 
 import discord
 from pytz import timezone
@@ -39,7 +40,7 @@ async def on_ready():
             directory = start_time.strftime("%Y/%m/%d")
             start_time = start_time.strftime("%H:%M")
             end_time = end_time.strftime("%H:%M")
-            filename = f"{date}-{event.name.replace('/', '').replace(':', '')}.md"
+            filename = f"{date}-{sanitize(event.name)}.md"
             fields = f"""---
 title: {json.dumps(event.name)}
 tags: ["hs3"]
diff --git a/sanitize.py b/sanitize.py
new file mode 100644
index 0000000..7e79bad
--- /dev/null
+++ b/sanitize.py
@@ -0,0 +1,27 @@
+import re
+
+safe = "abcdefghijklmnopqrstuvwxyz01234567890-_ .,"
+tomap = ("éàèùçâêîôûëïüąćęłńóśźżříšžčýůňúěďáéäüößœ",
+         (*"eaeucaeioueiuacelnoszzriszcyunuedae",
+          "ae", "ue", "oe", "ss", "oe"))
+map = {
+    **{c: c for c in safe + safe.upper()},
+    **{s: d for (s, d) in zip(*tomap)},
+    **{s.upper(): d.upper() for (s, d) in zip(*tomap)},
+}
+
+
+def sanitize(s):
+    return re.sub("_+", "_", "".join([map[c] if c in map else "_" for c in s]))
+
+
+if __name__ == "__main__":
+    def test(s):
+        print(f"{s} --> {sanitize(s)}")
+        print(f"{s.upper()} --> {sanitize(s.upper())}")
+
+    test("Pójdźże, kiń tę chmurność w głąb flaszy!")
+    test("Příliš žluťoučký kůň úpěl ďábelské ódy")
+    test("Fix, Schwyz! quäkt Jürgen blöd vom Paß")
+    test("HellOO 😂🤣--😍🥰 there, you!.md")
+    test("Voix ambiguë d’un cœur qui au zéphyr préfère les jattes de kiwis")