a condition in the template to start on #15, needs design

theme/balsamine/static/css/balsa.css

@@ -596,6 +596,11 @@ p.newsletter-signup{
     .is-swiped .schedule__head h1 { display: block; }
 }
 
+.schedule__category{
+  position: absolute;
+  transform: rotate(-90deg);
+  left: -20px;
+}
 .schedule sup,
 .schedule sub {
     margin-left: 1px;

theme/balsamine/templates/partials/event.html

 <article id="{{ article.slug }}" class="schedule__item" style='background: -webkit-linear-gradient({{ article.date|strftime('%d%m') }}deg, {{ article.color }} 0%, transparent 70%); background: linear-gradient({{ article.date|strftime('%d%m') }}deg, {{ article.color }} 0%, transparent 70%); top: 100%, url("/images/damier.png"); top: 0;' data-color="{{ article.color }}">
     <header class="schedule__header">
       <h1 class="schedule__title"><a href="{{ SITEURL }}/{{ article.url }}" rel="bookmark" title="Permalink to {{ article.title|striptags }}">{{ article.title }}</a></h1>
+      <p class="schedule__category">
+      {% if article.category %}
+        {% if article.category == "saison-17-18" %}
+          {% else %}
+            {{article.category}}
+          {% endif %}
+      {% endif %}
+      </p>
       <p class="schedule__authors">
       {% if article.piece_authors %}
           {% for author in article.piece_authors %}{% if loop.index > 1 %}/&#8203;{% endif %}{{ author }}{% endfor %}