diff --git a/agenda/__init__.py b/agenda/__init__.py
index d53174e..fa8440b 100644
--- a/agenda/__init__.py
+++ b/agenda/__init__.py
@@ -38,6 +38,8 @@ now_utc = datetime.now(timezone.utc)
 next_us_presidential_election = date(2024, 11, 5)
 next_uk_general_election = date(2024, 5, 2)
 
+xmas_last_posting_dates = {"first": date(2023, 12, 20), "second": date(2023, 12, 18)}
+
 config_filename = os.path.join(os.path.dirname(__file__), "..", "config")
 
 assert os.path.exists(config_filename)
@@ -276,6 +278,7 @@ def get_data() -> dict[str, str | object]:
         "mothers_day": next_uk_mothers_day(today),
         "fathers_day": next_uk_fathers_day(today),
         "uk_financial_year_end": uk_financial_year_end(today),
+        "xmas_last_posting_dates": xmas_last_posting_dates,
     }
 
     return reply
diff --git a/templates/index.html b/templates/index.html
index a0f4165..ac6d19b 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -57,6 +57,15 @@
     <li>US pres. election:
       {{days(next_us_presidential_election)}}
       {{next_us_presidential_election.strftime("%a, %d %b %Y")}}</li>
+
+    <li>Christmas last posting 2nd class:
+      {{days(xmas_last_posting_dates["second"])}}
+      {{xmas_last_posting_dates["second"].strftime("%a, %d %b %Y")}}</li>
+
+    <li>Christmas last posting 1st class:
+      {{days(xmas_last_posting_dates["first"])}}
+      {{xmas_last_posting_dates["first"].strftime("%a, %d %b %Y")}}</li>
+
     </ul>
 
   <h3>Stock markets</h3>