1. iPlanet statement is only valid for iPlanet version 7.0 service packs on Solaris 10, it is not valid for Solaris 11. I wasn't able to find any information about iPlanet 7.0 on Solaris 11 as certified platform for Siebel Web Server Extension version 8.1.1.x. You need to request a formal confirmation from Oracle Support regarding this certification as it is not documented.
2. I have checked a Public Sector 8.2.2 installation and it includes Siebel Marketing, wich has eEvents object manager. So the media pack you mentioned has Event Management: