Seeking event photography advice

My normal photography efforts have been outdoors for wildlife and landscapes. I have been asked to photograph a charity event next weekend for a non-profit organization who is putting on a dinner for military spouses whose husbands/wives are deployed overseas. I have volunteered my time and services to do primarily candid shots of the attendees and the guest speaker. It will be an indoor event in the evening in the ballroom of one of the largest hotels in Waikiki. There will be approximately 150 attendees. Most of the shots will be taken with ambient light using a Canon 7D with a 430 EX II speedlite (with diffuser). I have EF 24-105 f/4L IS USM and EF 70-200 f/2.8L II IS USM lenses. Other than bringing extra batteries and CF cards, anyone have any experience doing such shooting and have any useful tips?

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Aloha, Bud

www.budralstonphotography.com