Can I write a script to set an exp date on local calendar software once agreement is completed?

Hello all,

I asked a similar question earlier.  It seems that there is nothing that can be set to remind me 6 months after an agreement is completed that it will expire.  However, is it possible to write a script that will automatically open and set a date on the local calendar/reminder software that the completed agreement will expire 6 months from the date of completion?

Is it possible to set anything up like this:

Special Script entered into properties of agreement.

Agreement sent to client via esignature.

Agreement signed by client

Agreement automatically sent to Owner now that the client has signed

Agreement signed by owner

Agreement is now completed

Completed Agreement automatically sent to client, owner, me and anyone CCed in.

Script automatically triggered that opens up local reminder or calendar software and creates reminder/event 6 months from date of completion to notify/remind us that agreement is expired or is about to expire.

Is that at all possible?

Thank you for your time.

J