Product preference and trend analysis for gatherings of individuals at an event

An event check-in system, comprising:

• a computing system including a processor and memory, the computing system including:
• a system for setting up and managing an event;
• a system for registering a user physically present at the event, the system for registering obtaining an identity of the user and profile information for the user;
• a system for automatically registering items associated with the user, the system for automatically registering items including:
• a tag attached to each item associated with the user, the tag containing information regarding the item;
• and
• a tag reader for automatically reading the tag attached to each item to associate each item with the user;
• a system for storing event-user-item (EUI) information in an EUI database, the EUI information including the identity of the user, the profile information for the user, and the information regarding the items associated with the user;
• an analysis system for analyzing the EUI information to provide item preferences and trend analysis;
• and
• an ecommerce storefront for offering items to the user identified as relevant to the event by the analysis system based on the EUI information stored in the EUI database.