Hi All, I will be having a birthday party for my soon to be one year old son. The venue is a restaurant with quite a dim lighting. I am intending to use the Panny 20mm F1.7 as the main lens for most of the shots due to ease of use in terms of the focal length and perspective, though it is a challenge to focus accurately in dim lighting. I can't reduce aperture size, as the shutter speed probably will be too slow. So whats the tip of focusing with aperture wide open in such conditions to ensure I don't miss out on most of the actions?