A system for facilitating a sequence of events and comprising a data bank loader operative to set up for each individual event by loading into an event attendee data bank, IDs and pre-paid balance values, for users expected to attend said individual event, a multiplicity of portable receptacles issued to known users and storing a user ID and a pre-paid balance value for a corresponding user, e-cash filling stations incrementing pre-paid balance values of users in an on-site data bank, and mobile service provider workstations reading portable receptacles, accessing the on-site data bank according to the user ID of each portable receptacle, entering into a transaction with a user if his pre-paid balance value accessed from the on-site data bank is positive, and decrementing the transaction's value from the user's pre-paid balance value in the on-site data bank.