diff --git a/event/static/js/enrol_event.js b/event/static/js/enrol_event.js
new file mode 100644
index 0000000..fe8680e
--- /dev/null
+++ b/event/static/js/enrol_event.js
@@ -0,0 +1,18 @@
+$(function(){
+    function initEnrolment(elt) {
+        elt = $(elt);
+        elt.find("form.enrolment").on("submit", function() {
+            elt.addClass("sending-request");
+            var form = this;
+            var url = form.action + "?ajax";
+            $.post(url, $(form).serialize(), function(data) {
+                elt.html(data);
+                elt.removeClass("sending-request");
+                initEnrolment(elt);
+            });
+            return false;
+        });
+    }
+
+    $.each($(".activity-summary"), function(i, item) { initEnrolment(item) });
+});
diff --git a/event/templates/event/activity_summary.html b/event/templates/event/activity_summary.html
index 1513a7f..96f94fd 100644
--- a/event/templates/event/activity_summary.html
+++ b/event/templates/event/activity_summary.html
@@ -71,7 +71,7 @@
                                 {% endwith %}
                             </div>
                             <div class="col-sm-4">
-                                s'inscrire (TODO)
+                                {% enrol_btn activity request.user %}
                             </div>
                         </div>
                     </div>
diff --git a/event/templates/event/event.html b/event/templates/event/event.html
index faafb10..55dbbbf 100644
--- a/event/templates/event/event.html
+++ b/event/templates/event/event.html
@@ -3,6 +3,11 @@
 
 {% block title %}{% trans "Évènement" %}{% endblock %}
 
+{% block extra_js %}
+    {{ block.super }}
+    <script type="text/javascript" src="{% static "js/enrol_event.js" %}"></script>
+{% endblock %}
+
 {% block content %}
 <h1>{{ event.title}}
     {% if perms.event.event_can_change and user.is_staff %}
@@ -49,7 +54,9 @@
                         de <strong>{{ activity.beginning | time:"H:i" }}</strong>
                         à <strong>{{ activity.end| time:"H:i" }}</strong>
                     </span>
-                    {% include "event/activity_summary.html" with activity=activity %}
+                    <div class="activity-summary">
+                        {% include "event/activity_summary.html" with activity=activity %}
+                    </div>
                 </div>
             </div>
         {% endfor %}
diff --git a/event/templates/event/tags/enrol_btn.html b/event/templates/event/tags/enrol_btn.html
new file mode 100644
index 0000000..8bf45fd
--- /dev/null
+++ b/event/templates/event/tags/enrol_btn.html
@@ -0,0 +1,6 @@
+{% load i18n %}
+<form method="POST" action="{% url "event:enrol_activity" activity.pk %}" class="enrolment {{ enrolled|yesno:"enrolled,unenrolled" }}">
+    {% csrf_token %}
+    <input type="hidden" name="goal" value="{{ enrolled|yesno:"unenrol,enrol" }}" />
+    {{ enrolled|yesno:_("Inscrit,") }} <input type="submit" value="{{ enrolled|yesno:_("Se désinscrire,S'inscrire") }}" class="btn btn-warning"/>
+</form>
diff --git a/event/templatetags/event_tags.py b/event/templatetags/event_tags.py
index 186c290..3742972 100644
--- a/event/templatetags/event_tags.py
+++ b/event/templatetags/event_tags.py
@@ -7,3 +7,10 @@ register = template.Library()
 @register.filter()
 def get_herited(activity, attrname):
     return activity.get_herited(attrname)
+
+@register.inclusion_tag("event/tags/enrol_btn.html")
+def enrol_btn(activity, user):
+    return {
+        "enrolled": activity.staff.filter(id=user.id).exists(),
+        "activity": activity,
+    }
diff --git a/event/urls.py b/event/urls.py
index af334d4..54c81f5 100644
--- a/event/urls.py
+++ b/event/urls.py
@@ -1,5 +1,5 @@
 from django.conf.urls import url
-from event.views import Index, EventView, ActivityView
+from event.views import Index, EventView, ActivityView, EnrolActivityView
 
 app_name = 'event'
 urlpatterns = [
@@ -7,4 +7,6 @@ urlpatterns = [
         url(r'^(?P<slug>[-\w]+)/$', EventView.as_view(), name='event'),
         url(r'^activity/(?P<pk>[0-9]+)/$', ActivityView.as_view(),
             name='activity'),
+        url(r'^activity/(?P<pk>[0-9]+)/enrol/$',
+            EnrolActivityView.as_view(), name="enrol_activity"),
 ]
diff --git a/event/views.py b/event/views.py
index db151dc..5a5d3df 100644
--- a/event/views.py
+++ b/event/views.py
@@ -1,6 +1,8 @@
-from django.views.generic import TemplateView
-from django.views.generic import DetailView
+from django.views.generic import TemplateView, DetailView, View
 from django.contrib.auth.mixins import LoginRequiredMixin
+from django.shortcuts import get_object_or_404, render
+from django.http import JsonResponse, HttpResponseRedirect
+from django.urls import reverse
 
 from .models import Event, Activity
 from equipment.models import EquipmentAttribution
@@ -34,3 +36,22 @@ class ActivityView(LoginRequiredMixin, DetailView):
                                    .filter(activity=activity)
                                    .prefetch_related('equipment'))
         return context
+
+
+class EnrolActivityView(LoginRequiredMixin, View):
+    http_method_names = ['post']
+
+    def post(self, request, pk, *args, **kwargs):
+        activity = get_object_or_404(Activity, id=pk)
+        action = request.POST.get("goal", None)
+        success = True
+        if action == "enrol":
+            activity.staff.add(request.user)
+        elif action == "unenrol":
+            activity.staff.remove(request.user)
+        else:
+            success = False
+        if "ajax" in request.GET:
+            return render(request, "event/activity_summary.html",
+                          {"activity": activity})
+        return HttpResponseRedirect(reverse("event:activity", kwargs={"pk":pk}))
diff --git a/shared/static/css/global.css b/shared/static/css/global.css
index 4533628..568d35a 100644
--- a/shared/static/css/global.css
+++ b/shared/static/css/global.css
@@ -359,4 +359,21 @@ a.module {
 .glyphicon.dunno {
   color: #5599C4 !important; }
 
+.sending-request {
+  position: relative; }
+  .sending-request:after {
+    content: "Chargement...";
+    position: absolute;
+    width: 100%;
+    height: 100%;
+    background: #fff;
+    opacity: 0.8;
+    color: #777;
+    text-align: center;
+    box-sizing: border-box;
+    z-index: 5;
+    top: 0;
+    left: 0;
+    padding: 8%; }
+
 /*# sourceMappingURL=global.css.map */
diff --git a/shared/static/css/global.css.map b/shared/static/css/global.css.map
index cd7ffeb..9da2885 100644
--- a/shared/static/css/global.css.map
+++ b/shared/static/css/global.css.map
@@ -1,7 +1,7 @@
 {
 "version": 3,
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 "sources": ["global.scss","variables.scss","messages.scss","header.scss","forms.scss","tree.scss"],
 "names": [],
 "file": "global.css"
-}
+}
\ No newline at end of file
diff --git a/shared/static/css/global.scss b/shared/static/css/global.scss
index 71eacf6..7a2088e 100644
--- a/shared/static/css/global.scss
+++ b/shared/static/css/global.scss
@@ -250,3 +250,23 @@ a.module {
         color:$dunno_color!important;
     }
 }
+
+.sending-request {
+    position: relative;
+    
+    &:after {
+        content: "Chargement...";
+        position: absolute;
+        width: 100%;
+        height: 100%;
+        background: #fff;
+        opacity: 0.8;
+        color: #777;
+        text-align: center;
+        box-sizing: border-box;
+        z-index: 5;
+        top: 0;
+        left: 0;
+        padding: 8%;
+    }
+}