Booking system – selectable dates and times

Hi,
I am trying to find a plugin that will allow me to set up a system that will allow a site visitor to book a place or places at an event, there will be three daily events, running 7 days a week. It also needs to integrate with Paypal-Website-Standard payment system.
Any plugins that I have found do not allow multiple choices as far as dates and times, and it is possible that the number of events per day may increase, it also needs to be able to allow me to offer adult rate and a reduced rate for children/concession tickets.
Any help would be fantastic, and much appreciated.

Thanks,
Mark