The homepage, forum, wiki and IRC will be going offline for about five minutes on 2016-10-29, between 07:00 and 07:15 UTC.
For convenience, this means:
EDT (USA east coast):
2016-10-29, 03:00-03:15
BST (UK):
2016-10-29, 08:00-08:15
AEDT (Australia east coast):
2016-10-29, 18:00-18:15
The intent is to install security updates on the server which hosts the homepage, forum, wiki and IRC. These will be non-disruptive to functionality, as the server is running a stable OS release that gets critical fixes only.