Use Doodle for easy event scheduling. You can propose several dates and times and the participants can indicate their availability online.
Doodle has increased its position on the list by 13 places this year.
Comments from some of those who selected Doodle as one of their top tools
easy way to schedule meetings with colleagues, 2013
It used to take a long time to schedule meetings until I discovered Doodle – now it takes a fraction of the time – so we have discovered huge productivity savings, Kim Kingdom 2013