In Numbers^x, Invitations^x, Writing styles^x

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, ...

Hello all I'm a new here and I hope anyone who is native Eng. speaker can help me with this formal invitation letter.(ASAP) I need to turn this in to my boss tommorrow. I tried so hard to write this letter but I just can't figure it out. Please check my grammar and my writing style. Thanks...