TRANSMISSION OF INVITATIONS, DATA, DOCUMENTS, MEETING SCHEDULES, ELECTRONIC MAIL, CALENDARS, ANNOUNCEMENTS, PHOTOGRAPHS, AUDIOVISUAL MATERIALS, AND GREETINGS VIA AN ELECTRONIC COMMUNICATIONS NETWORK; PROVIDING ON-LINE FORUMS FOR TRANSMISSION OF MESSAGES AND COMMUNICATIONS AMONG COMPUTER USERS IN THE FIELD OF BUSINESS MEETINGS, BUSINESS DEVELOPMENT, EVENT PLANNING, AND ACTIVITIES PLANNING