What should the letter say? Start with a clear salutation addressing the consular officer.An invitation letter for the sake of a B2 visa is not required. No invitations, no sponsorships - in fact no documentation is required. Please be ready to provide your complete official name, date of birth, physical address, email address, and passport number (if available). There is no requirement for an invitation letter. If you want to send on send it to your parents who in turn may present it to the US consulate. Foreign travelers wishing to participate in GlassBuild America 2024 can generate personalized letters of invitation.