Yeap, looks like it's for real. I'm all for having a 日 for 粉丝 to celebrate the 图书 and/or JK Rowling, but 7 分钟 of silence?!! I agree with cassie-1-2-3's
link on that one: it's disrespectful towards
real victims of tragedies and wars.
Something a bit 更多 Harry Potter related should have been picked to do on the day. I like how 粉丝 of Douglas Adams have Towel 日 - where 粉丝 are encouraged to carry a towel with them on the 25 of May, because according to the Hitchiker 图书 a towel "is about the most massively useful thing an interstellar hitchhiker can have."