Joomla module Event Calander

I need a Event Calender module for my joomla site. Here is the function will do. I have group of people we meet once a month and mostly we have a problem to get majority people in the meeting. So my plan was everyone to be able view calender and the calender will have option on the meeting week for users to select there availability date on that week, they can select more than one day and finnaly the result shows which day the majority of people are available. So that day will be the meting day. This module should work for the existing users and they are the one including admin can use the calender. My budget is $50 or less Thank you