meetup - yahoo groups clone based on dolphin

I need a meetup / yahoo groups clone based on dolphin

Example
meetup => http://beppegrillo.meetup.com/
yahoo => http://groups.yahoo.com/group/ObamaBrigade/

Features

• Members can create groups which will be listed in Groups Directory

o Group Polls - Members can create a group poll
o Group Events - Members can create a group event
o Discussion Board - Enable members to post messages in a group
o Group Photos - Members can create a group photos
o Manage Group - This feature allows a member to manage the group type (public, moderated or private) and change other settings such as group URL, title, description and category
• ability to personalize group by choosing a template, modify colors, use custom CSS tags
• moderator of the club has an ability to manage members
• View the most popular and newest groups in the directory
• Ability to search for groups by keywords, zip,
• Email Alerts/Notification for new poll, new events …