Although not a requirement, your U.S. host can write a letter. We've provided a sample invitation letter for a B-2 visitor visa.Craft personalized and effective Invitation letter for a visa, whether it's for business or tourism in 5 minutes. According to guidance from the U.S. Department of State, an invitation letter from MCC is not needed for your relatives to apply for a visitor's visa. You should include the name of the host, formal expression, the event purpose, date, time, and venue, contact details, and RSVP. It must include the address, date, and time of the event on the left side of the letter. Use this sample invitation letter template to help draft your next communication.