Magento site need small extension.

Hi, I have magento site which need small extension. our proudcts are actually 'events'. We sell events thought this site.. [Now in 'event information' tab we need multi-date field. We need a field named 'Event Dates' here , but we don't need just one single date. We need multiple dates because an 'event' can be held on multiple dates. U got the idea? what is the best way to do it? would u use multiple calender controls? no 'start at' and 'end at' are for time only... ok.. we need new fields named 'Event Dates' and it could be a calendar control or anything else... but here we want multiple dates to be selected... e.g there is ValidTill field as well but here you can enter only 1 date. We need a field where we can select more than 1 dates, how is it possible? Is that possible with a calender control? please tell me beause I need to update client about it? I need something like this where user can select as many as he wants... [login to view URL] if admin wants to select 10 differents dates then there would be 10 calendar on the UI? we need to make it dynamic.. we can't fix it to 10 or 12 calendars.. we make it dynamic? means just place add button and admin will add as many as we want? So please start with the admin panel first , later on we need to show these dates on frontend as well. But first start with admin panel under 'event info' but this is just first part, later on you need to work on frontend and I will install an extension shortly , you need to customize it as well. but that is all related to multi-date , so only 1 developer can handle it properly when do you think you can complete this backend task first? and please note that we don't need fixed number of calendar, we need 'add' button so that admin can add as many 'dates' as he wants for an event... My budget is 30$ for this job. I need developer who continuously working on this job. So need long term developer after this current task done. So this on going job which need updates and changes continuously on site. Thanks