Fixed some front-end date issues and one admin problem

Fixed some front-end date issues and one admin problem

Fixed date and time displayed for an event on registration page so it reflects only current or future dates and times.
Fixed time displayed for an event on registration page so it no longer shows a range of times, only the time for the date shown.
Added display of "(see below for other dates/times)" when there are more than the first date/time displayed on the registration page.
Fixed problem where viewing a request from a sold-out event caused the attendees to be removed and the request if there were no attendees.