In Formal letters^x, Grammar^x, Invitations^x

Hello, I am Korean and I live now in Seoul. In recently, I write an English letter on behalf of my aquaintance who is musician and have a concert in his own house in Seoul. He has invited pretty many foreign performers to his house and had concerts since 2002. On January next year a...

Hello all. I am new here and I hope someone who's native in Eng. can help me. (ASAP) I need to turn this in to my boss by tomorrow. This must be a formal invitation letter. Please check my grammar and also my writing style (I know it's really bad) Thank you in advance Dear Sir or Madam, ...