Abstract: The method of creating and hosting customized online gatherings (“parties”). One or more server computers communicate via the Internet with Web browsers operated by users. The server computer(s) store data defining one or more template web pages that implement one or more activities in which users may participate. One of the users serves as the host of the online gathering and provides a guest list identifying other invited users. In response to the host's selection of a gathering type, and possibly a specific theme for the gathering type, the server constructs a set of preliminary web pages that conform to the selected gathering type and theme. Thereafter, the host may further “decorate” the preliminary pages by supplying additional or replacement text, additional or replacement graphical image files, audio files or video clips that are incorporated into the template web pages to produce the desired customized online gathering.