Concierge.com is an event technology platform that allows users to design and create HTML emails, event pages, and registration sites. It offers the ability to customize and personalize event assets for different groups, track RSVPs and registrations in real-time, and manage attendee travel. The platform generates detailed itineraries based on attendees' group data and personalized profiles, and allows for delegation of specific tasks to team members or clients. Additionally, it offers features such as digital signature capabilities, instant communication with attendees, and report templates.