Event RSVP feature for a non-profit social networking website

A non-profit organization social networking website based on phpBB2+ needs to add the event RSVP feature. We would like to have a "Local Events" section on the home page. All the upcoming local events will display a title and a RSVP link in the "Local Events" section. Click "RSVP" link allows registered users to RSVP for the specific event with a brief message and total number of attendants. If the user has not logged in, the login page will be displayed 1st. Once users register for an event, they will get e-mail confirmation. Event organizer / poster can see the RSVP users' name and e-mail. Users can change their decision before the RSVP deadline. It's a specially trimmed version of "evite.com". For all the local events posted on the website, auto generate a weekly newsletter in pre-defined HTML format with all the upcoming events' links in the e-mail newsletter and send to ALL registered users in a pre-defined the time (e.g. Friday, 3:00am). The social networking website is bilingual in both English and Chinese. The winning bidder is based on good reference works, cost and ratings.