• Use a Google Spreadsheet to create a list of meetings or conference sessions
• Use a Calendar to display the schedule
• Use a Form to allow participants to register
• Features:
• Limit the number of registered participants (or not)
• Set a minimum number of participants (with an automated email if registration is too low)
• Send an immediate confirmation email to participants
• Add event to participant's personal calendar
• Send an automated reminder email to participants

In this example, I have created a registration system for the Questionable Movies Conference.

• See the spreadsheet that manages it and the calendar presented below.
• See the calendar that shows the schedule and allows participants to register
• Click on any event title to see the details and to register for the session.
• The resources are in this folder: http://goo.gl/ymYp4P