Pokémon Day is an annual celebration of all things Pokémon. It is held every year on Feb. 27 to mark the release of the original game in Japan. You can expect a lot of exciting announcements and product launches to go live on the big day, but there's actually no need to wait.
Again, it depends on the context. If it’s for a one-off event with a lot of people you don’t know, there’s probably no need.
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客运方面，自 2 月 15 日（腊月二十八）至 2 月 23 日（正月初七），探亲流、务工流与旅游流叠加，全国铁路日均发送旅客 1341 万人次。
However, Koch never credited the Hesses for their discovery of bacteriological agar, perhaps because, at the time, he failed to recognize its importance. Even after he received the insight about agar from the Hesses, Koch stuck with gelatine for years. In 1883-84, during his first medical expedition to Egypt and India to investigate cholera, he tried and failed to grow the cholera bacterium on gelatine media in the hot climate of Cairo (despite using a half-open fridge for incubation), only succeeding in the colder winter of Calcutta.