Learn the story of the Herdsman (the star Altair) and the Weaver Maid (the star Vega) along with traditional customs for the timeof the Seventh Moon of the Seventh Month which is thought of as Chinese Valentine's Day.
Here is a bit about the astronomy associated with the Double Seven Festival, which is also known as the Magpie Festival. Here is more about the Magpie Bridge, and why you do not usually see magpies on the Double Seven Festival.
Another version of the story includes more details. This version includes beautiful traditional illustrations. Here you can read the origin, schedule, and poem about the festival.
This Wikipedia article includes a few variations of the story.