When the National Day (October 1st) coincides with the Mid-Autumn Festival (usually around late September or early October), there isn't a specific English saying that encapsulates the combination of these two festivals. However, people often use a variety of expressions to describe this special situation. Here are a few possibilities:

1. "Double joy for the Chinese New Year and Mid-Autumn Festival."
2. "The most festive time of the year with National Day and Mid-Autumn Festival!"
3. "Celebrate twice as much joy with National Day and Mid-Autumn Festival!"
4. "A double holiday bash with National Day and Mid-Autumn Festival!"
These phrases convey the sense of happiness and double celebration that comes with having both holidays close together.
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