You could try this?
or you could create own by using user macro and getting it to output HTML and just paste in your calendar code.
e.g. the embed code for the UK Holidays calendar would be
<iframe src="https://www.google.com/calendar/embed?src=uk%40holiday.calendar.google.com&ctz=Europe/London" style="border: 0" width="800" height="600" frameborder="0" scrolling="no"></iframe>
Info on how to write user macros
and how to get the embedding code from google
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