End Date based archive setting needed

Hi Friend,

Now a days I am working on a project where we have Events functionality. Events have two fields "Start Date" and "End Date", both are not mandatory field unfortunately. Now my problem is I want to put functionality of automatically archive on the basis of "End Date", like if I have Event which start from June 01, 2010 and End on June 07, 2010, now at the end of June 07 my event automatically added in archive and on the same time I need function like check box to send node in archive which do not have "End Date".

Its really urgent and I dont know what to do :(.

Please help me out with your idea

Thanks in Advance.

Regards,
Aditya