The origin and meaning of the July 15th festival can be expressed in English as follows:

"The origin and significance of the July 15th festival come from [the specific cultural background or historical context]. It holds [the festival's traditional importance or symbolism], embodying [the core values or customs associated with the celebration]."
If you want to mention a specific festival on July 15th, you would provide the name of the festival and then describe its origin and meaning. For example:
"The Mid-Autumn Festival, also known as the Moon Festival, is celebrated on July 15th according to the lunar calendar. Its origins date back to ancient times, and it is a festival of harvest and reunion. The festival is symbolized by the full moon, which is associated with family gatherings, mooncakes, and various cultural practices."
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