The MLJC schedule is always flexible, put down your say on the wiki. The machine on which the wiki is hosted is subject to change,
I figure using the “wiki” site should be easy, but if you are unsure you can play with editing at http://www.gatsby.ucl.ac.uk/~iam23/internal/wiki/Sand_box. More information is at http://www.gatsby.ucl.ac.uk/~iam23/internal/wiki/Example_page.
If you are outside the Gatsby firewall there are two options:
General tunneling method
ssh -D 1080 ssh.gatsby.ucl.ac.uk
Configure your browser to use localhost port 1080 as your SOCKS 5 proxy and to use it for remote DNS. In firefox set the proxy in (Edit|Preferences|General|Connection Settings). Then type about:config<ENTER> in the location bar and turn on the network.proxy.socks_remote_dns option. Now all your web browsing (including https://) will automagically go via Gatsby. In particular the above links should Just Work.
If you do this sort of tunneling a lot and need to quickly toggle proxy settings then the SwitchProxy firefox extension might help.
My old tunneling recommendation
ssh -L 5555:bremer.gatsby.ucl.ac.uk:5555 ssh.gatsby.ucl.ac.uk
Windows people can do this in Cygwin or putty allows forwarding through its GUI. Then go to: http://localhost:5555/wiki/MLJC_scratch_pad, http://localhost:5555/wiki/Example_page or http://localhost:5555/wiki/Sand_box. instead.