Yeah, I dl'd it from the link. But, .ics doesn't support images/graphics, only text.
That calendar of yours is graphic intensive! 82MB lol
I don't know what your email client is, or if you have Calendaring support, but see if it supports iCal, iCalendar, or .ics files. If it does, you might want to download
this Holiday Calendar file and import it, then modify it to your liking...minus the graphics. lol