Hello, my family and I would like to visit Hong Kong for a week- tourist. We are from Nigeria.

Hi, as far as I know, the invitation letter is not a must. If you don't have it, it's fine. You can print a copy of your round-trip tickets and hotel reservations and a copy of your bank statement. Besides, prepare a copy of your passport and a filled-out application form affixed with a recently-taken bare-headed photo. Then submit all the above-mentioned documents to the embassy.