Dear:
I would hereby invite the members of Beijing delegation totally 4 persons (listed attachment) led by you, to come over tocountry) for (exposition), which is to be held at (place) during (date). Please make the necessary arrangements for your delegation to arrive in (country). During the exposition, you will stay here for days. All your expenses including international air tickets, local transportation, accommodations, medical insurances and all other related expenses during your stay here will be paid by yourselves.
We are looking forward to greeting you in (country) very soon.
Yours sincerely,