Hey, thanks for your message - glad you like the site ;-) It is still a work in progress (and probably always will be :-P ) - I need to really sort out the background when I have time, as on some resolutions it doesn't show right.
Anyway, the main problem with incorporating the type of calendar we're after is that Blizzard don't currently allow it. It requires a code or link from themselves, in order for it to be pulled to other sites - which they used to have, but since the Armories changed last year, they removed it. It has been asked for again on the Blizzard forums, but there has been no response.
I have posted a new request on their forums today, so we'll see what happens:
http://eu.battle.net/wow/en/forum/topic/3389171099?page=1#0
I had mentioned it a while ago on the guildlaunch forums too:
http://support.guildlaunch.com/forums/viewtopic.php?t=6789884&postdays=0&postorder=asc&start=0&gid=535
Perhaps it's time to revisit it :-P
We (or some of us anyway) use an addon calendar in-game called
Group Calendar - I seem to recall it has the ability to let you export the calendar data in iCal format for use on other websites - in theory it would be possible to either use the Guildlaunch calendar, assuming it has an import option (I'll have to test it), or possibly incorporate an external widget - however, I'm more of the "lets see what interesting stuff other people have made" type of website builder, rather than the "make it myself" - so I'd need at least a basis of a widget to cobble it onto :-P
This method would, in theory, work - but it would require the admin of the website to also run the addon in game, and to regularly upload the data into the widget (probably daily). Which, as far as I know, would have to be done manually each time.