diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0813c24..9db5120 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,6 +2,7 @@ image: klakegg/hugo:0.88.0-ext-ci # recommended image by Hugo: https://gohugo.io
 
 test:
   script:
+  - ./checkdates.rb
   - hugo
   except:
   - master
diff --git a/checkdates.rb b/checkdates.rb
new file mode 100755
index 0000000..0334a1d
--- /dev/null
+++ b/checkdates.rb
@@ -0,0 +1,36 @@
+#!/usr/bin/env ruby
+
+require 'yaml'
+require 'date'
+
+class YAMLFrontMatter
+  PATTERN = /\A(---\r?\n(.*?)\n?^---\s*$\n?)/m.freeze
+
+  class << self
+    def extract(content)
+      if content =~ PATTERN
+        [YAML.load(Regexp.last_match(2), permitted_classes: [Symbol, Date, Time]), content.sub(Regexp.last_match(1), "")]
+      else
+        [{}, content]
+      end
+    end
+  end
+end
+
+Dir["content/eventos/*/index.md"].each do |filename|
+  metadata, _ = YAMLFrontMatter.extract(File.read(filename))
+
+  raise "#{filename}: wrong layout: #{metadata["layout"]}" unless metadata["layout"] == "evento"
+  raise "#{filename}: no title" unless metadata.keys.include?("title")
+  raise "#{filename}: no metadata" unless metadata.keys.include?("metadata")
+
+  raise "#{filename}: no event location" unless metadata.dig("metadata", "event", "location")
+
+  start = metadata.dig("metadata", "event", "date", "start")
+  finish = metadata.dig("metadata", "event", "date", "finish")
+
+  raise "#{filename}: no event start date" unless start
+  raise "#{filename}: no event finish date" unless finish
+
+  raise "#{filename}: time paradox: #{start} - #{finish}" unless start.to_time <= finish.to_time
+end
diff --git a/content/eventos/2021-08-21-foss4g-2021/index.md b/content/eventos/2021-08-21-foss4g-2021/index.md
index 2b1e8d3..198d447 100644
--- a/content/eventos/2021-08-21-foss4g-2021/index.md
+++ b/content/eventos/2021-08-21-foss4g-2021/index.md
@@ -1,5 +1,5 @@
 ---
-categories: []
+layout: evento
 metadata:
   event:
     location: Online
diff --git a/content/eventos/2023-10-12-devops-na-praia/index.md b/content/eventos/2023-10-12-devops-na-praia/index.md
index 541502a..d609028 100644
--- a/content/eventos/2023-10-12-devops-na-praia/index.md
+++ b/content/eventos/2023-10-12-devops-na-praia/index.md
@@ -3,7 +3,7 @@ layout: evento
 title: Devops na Praia #2
 metadata:
   event:
-    location:
+    location: Wunderman Thompson Commerce - Edifício Transparente, Porto
     site:
       url: https://www.eventbrite.pt/e/bilhetes-devops-na-praia-2-720753933417?aff=oddtdtcreator
     date: