Yes, the specific day/date is over, as answered by Mr Akshay Mr. Rao.; But, then.. We can perform any Ganesha Pooja with request him to accept it.
It was last week.. the celebrations, like every year, last the whole week (or 9 days).. it was 26th August this year if I'm not mistaken.. It is based on the Lunar Calendar so it changes Every year
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