Make lessons with event pruple

biscuit/apps/chronos/templates/timetable/lesson.html

@@ -12,7 +12,7 @@
                     {% endif %}"
 
                     {# Add CSS class for sub when it's a sub #}
-                 class="{% if element_container.substitution %}lesson-with-sub{% endif %}">
+                 class="{% if element_container.substitution %}{% if element_container.substitution.table.is_event %}lesson-with-event{% else %}lesson-with-sub{% endif %}{% endif %}">
                 <p>
                     {% if element_container.substitution %}
                         {# SUBSTITUTION #}