A small bit of HTML code will add a "subscribe to Google Calendar" button to a web page. The general format of the code is:
<a href="http://www.google.com/calendar/render?cid=[CALENDAR-XML-LINK]" target="_blank"><img border="0" src="//www.google.com/calendar/images/ext/gc_button6.gif"></a>
For example:
<a href="http://www.google.com/calendar/render?cid=http%3A%2F%2Fwww.google.com%2Fcalendar%2Ffeeds%2Fsstx.org_siq5ectrvg921eipq0qdu5fho4%2540group.calendar.google.com%2Fpublic%2Fbasic" target="_blank"><img border="0" src="//www.google.com/calendar/images/ext/gc_button6.gif"></a>

To get the correct value for [CALENDAR-XML-LINK], open the calendar's Details page, scroll down to the Calendar Address section. Click on the XML button.

Copy the link that appears in the pop-up window.



There are 6 button styles available. Change the digit in the "src" file name (gc_button1.gif or gc_button2.gif, etc).  Button #6 is probably the best choice.

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