If it is simply a visibility of the event on the front end you can set the access level for the event to Registered initially, then after 2 weeks change it to Public.

If this is something you want to do for all your events then you could set up a php script that monitors the published date of an event, and after 2 weeks changes the access level to Public. You would set up a cron task to do this that runs daily.

if this is for only some events then define a specific category for them and only check events assigned to that category.

All pretty easy with a little bit of php understanding and knowledge of the table elements involved.

Hello,

As above. If there is anything else we can help with please do let us know.

Many thanks
Tony