Invitations for the 30th anniversary are send when you plan to celebrate your 30. birthday. Usually such invitations are send using birthday invitation cards. You can buy ready to send cards for this anniversary and just insert some custom words and information like the place and time of the birthday party or you can create you own invitation cards using a computer. There are also some websites which allow online creation of custom invitation cards. You just have to select a picture, insert your own text and print it. You should also include some funny birthday sayings or quotes.