No matter what, it'll be adorable! Hazel and my nephew (same age...also April '09) were in a wedding in Dec together. Hazel didn't fully cooperate, she wouldn't stand at the alter, but that was fine. My nephew was a total cutie and threw the ring pillow the last 5 feet of aisle, turned around and high-tailed it back down the aisle almost mowing down the bride. The cogregation just laughed, makes for great memories!!!
For keeping him occupied at the seats, iPhone videos (you tube) and head phones...worked a charm with Hazel and Mickey Mouse Clubhouse