fridays: link to how knowledge sharing session schedule is made

fridays.md

@@ -25,14 +25,17 @@ things. To inspire and teach each other we will organize a sharing
 activity every week. We all have something to share! So everyone is
 required to present something once every cycle.
 
-The schedule is managed in this shared google calendar:
+The schedule is managed in a [shared google calendar][cal].
 
-https://calendar.google.com/calendar/embed?src=olindata.com_al1t8ln0iqmolkkd9diqi4jm3c%40group.calendar.google.com&ctz=Europe%2FAmsterdam
+See also Oliver's [blog post][schedule] on how the schedule is generated.
+
+[cal]: https://calendar.google.com/calendar/embed?src=olindata.com_al1t8ln0iqmolkkd9diqi4jm3c%40group.calendar.google.com&ctz=Europe%2FAmsterdam
+[schedule]: https://olindata.com/en/blog/2018/08/fun-calendar-automation
 
 In preparation of this event we'd like you to come up with a subject
 at least a week in advance. If you have any trouble thinking of
-something, or need help preparing a talk don’t hesitate to ask for
-help from any of your colleagues. There aren’t much restrictions to
+something, or need help preparing a talk don't hesitate to ask for
+help from any of your colleagues. There aren't many restrictions to
 what you can present, but the talk should preferably be at least 15
 minutes unless there is good reason not to. A good session should take
 30-45 minutes in total, with a maximum of an hour.