<h2>Réservations en cours sur les 4 prochaines semaines</h2>
<div>
{% regroup json.data by day as activites %}
{% for act in activites %}
  {% with f=act.list|first %}
    {% ifchanged %}<h3>Semaine du {{ f.week|split:":"|slice:"1:2"|first|date:"j F Y" }} au {{ f.week|split:":"|last|date:"j F Y" }}</h3>{% endifchanged %}
  {% endwith %}
  <p>{{ act.grouper|date:"l j F Y" }}</p>
  <ul>
    {% for l in act.list %}<li><span {% if not l.booked %}style="color: lightgray;"{% endif %}>{{ l.activity_label }}</span>{% endfor %}
  </ul>
{% endfor %}
</div>
