Add new signup mechanism to agree to all open space events

_layouts/all_open_space_events.html

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+---
+layout: society
+---
+
+{{ content }}
+
+<script charset="utf-8" type="text/javascript" src="//js-eu1.hsforms.net/forms/embed/v2.js"></script>
+<script>
+    hbspt.forms.create({
+        region: "eu1",
+        portalId: "25488214",
+        formId: "c3daf325-822d-46f5-b121-9e5e021cce19"
+    });
+</script>

society/events/all_open_space_events.md

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+---
+layout: all_open_space_events
+title: Samman Coaching Society Online Open Space Events
+---
+
+# Samman Coaching Society Online Open Space Events
+
+_Bring your questions and exchange experiences with other technical coaches._
+
+The Samman Society hosts one hour online open space events approximately once a month. You can find the next one listed on the [Events]({% link society/events/index.md %}) page. Usually people sign up for one event at a time. This page lets you sign up for all future events. 
+
+If you fill in the form lower down on this page you will receive a meeting link by email every time we hold an open space event. This email will also include a link to unsubscribe if you no longer wish to receive these emails.