I’ve have a similar although more extended question,
A registered user or a user with a certain level or role, should have a tab in the admin section which says Agenda. At that location he can upload an event on a specific date, select the events category and add some text and links maybe an image (e.g. automatically resized to avatar size 80 px x 80 px). In the end he post it onto the front-page where it shows up in the weblog agenda.
Visitors of the website can browse though the agenda by date and category. Registered users see a link where they can add a agenda event themselves. There should be a distinction between old agenda events and events on future dates.
Very nice adds would be if visitors can e-mail an event to a friend, registered can notify other users that they will attend this event (like you can do at upcoming), visitors and users can comment on an event, everybody can social bookmark the event (e.g. on digg, delicious). An other nice feature would be a sidebar widget which shows today’s and upcoming events placed on the weblog’s agenda page.
WordPress Event Calendar plugin is a great plugin for most WordPress users. Although I do not want to allow all my users to write post. So the agenda or event calendar should be a stand alone feature in the admin panel.
Please read my forum post for more about my eventcalendar wishes.
Vincent
