Add a field macro to the event creation form

calsocial/templates/event-details.html

@@ -1,4 +1,5 @@
 {% extends 'base.html' %}
+{% from '_macros.html' import field %}
 
 {% block content %}
 <h1>
@@ -28,9 +29,7 @@
 <form method="post">
     {{ form.hidden_tag() }}
 
-    {{ form.invitee.errors }}
-    {{ form.invitee.label }}
-    {{ form.invitee}}
+    {{ field(form.invitee, inline=true) }}
 
     <button type="submit">{% trans %}Invite{% endtrans %}</button>
 </form>