众所周知,+ [clause]
[clause] + 是众所周知的
众所周知的 + [noun]
众所周知 is a chengyu, "as all know". It opens a sentence with a comma and introduces common knowledge, usually as the base for a point that follows. It belongs to essays, speeches and articles.
是众所周知的 closes a sentence, and 众所周知的 + noun describes a fact or a name everyone knows.
众 already means "everyone", so 大家 or 人人 in front says it twice.
The fact really has to be public knowledge. News about yourself or a small group isn't, and 众所周知 sounds odd in front of it.