"Are summer solstice, winter solstice autumnal equinox and spring equinox public holidays in your country?"
"Are ~ national holidays in your country?"
"Are summer solstice, winter solstice autumnal equinox and spring equinox public holidays in your country?"
"are ~ public holidays in your country" 「あなたの国では〜祝日ですか」
"your country" 「あなたの国」
"public holiday" 「祝日」
"summer solstice" 「夏至」
"winter solstice" 「冬至」
"Autumnal equinox" 「秋分」
"Spring equinox" 「春分」
"Are ~ national holidays in your country?"
"national holiday" 「祝日」代わりに "a day off" も言えます。