Description
Hello, please excuse the issue but it seemed the best way to get in touch. Just close this if you don't care and I'll get the hint!
I work on Open Source software specially for what your doing - namely, a calendar that the community works together on. It lets many people edit the calendar safely and has all kinds of Open Data feeds (including for when data changed - #9). Honestly, the CFP deadlines is not something we have an easy way to hook up but is something that would be an interesting challenge to look into. But apart from that I hope you'll find this pretty good.
Anyway, the software is at http://ican.openacalendar.org/ and it's used mainly in the UK to run this calendar of Tech Events: http://opentechcalendar.co.uk/
Hope this is of interest and happy to answer questions,
Thanks,
James