13+ Sample Invitation Letters - Writing Letters Formats An official invitation letter could be about official parties, New Year celebration, business anniversaries, in the memory of any achievement. Another type of invitation letter is for a charity walk, music concert, any theater play or anything like this. All these invitations are Invitation Letter to a Guest Musician - No honorarium In this letter of invitation, a musician is invited to perform. It is customary to expect to cover the expenses of any guest speaker or musician you invite, however, there are time when a group cannot possibly afford to cover such cost and the guest speaker or performer may still be willing to honour the invitation.
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