Filming at events can be a bit of a minefield. I film at a lot of events. To be honest, a lot of event organisers just expect a video covering the event as an overview. But there can be a lot more to it than that. There's an opportunity to get more and more video footage to use for months on end, perhaps throughout the entire year.
Working out what you want to get from your event videos is the first problem. I'd suggest sitting down to work out the following:
By working this out you'll have a small insight into why you're getting your event filmed and what you want to happen to the footage afterwards, then you can start thinking about who you want to be involved in the filming (staff, franchisees, customers) and what you want them to say, so that it rings the appropriate bells with your viewers.