The home page should introduce the company, offer a simple one step signup form (allow for fb connect), and potentially show some example events at the bottom (like testimonials). Those example events can be the top trending events so feel free to incorporate thumbnails into the homepage (ala 500px.com)
The single event page should show the pictures that were uploaded for the event, the description, and some indication of the location along with the event details (how many people attended, the client, the venue, the vendors used, budget range). The focus should be on pictures then details.
The portfolio page should have thumbnails of all the events for one person ala pintrest/500px/chill.com. People should be able to express their emotion about an event and comment on it. However, the main focus of this page should be on the content, not the social features like commenting and liking, those should be subtle ala 500px.