I have been asked to do some investigation regarding a method to serve an emergency information website should there be a critical, very high traffic situation. We estimate that traffic would quintuple from our current to about 30K visits a day for a few days. Would would point traffic from our current domain to something like emergency.domainname.com. The current thinking is that the traffic would be redirect from the current domain in IIS.
No one wants to use our current CMS for this, but rather WordPress or something else. The obvious, a static HTML page is out. I have a separate research track for optimizing WP, so my question is, is there a hosted, easy to use CMS that can handle huge traffic? Like Squarespace but for enterprise.