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Go to the following forum page

https://www.airportcitygame.com/forums/airport-city-news.10/

In the right upper section where the button to post a new thread is located should be the option to watch this forum.  Click it

Then go to your alert preferences section and make sure you have notifications for watched forums turned on.

[ATTACH=full]9327[/ATTACH]

This will allow you to receive notifications when someone posts a new thread to that forum.  Every Friday there will be a post for the weekend code.  It is good for about about 48 hrs.  This is not exact...but seems to time the same as the weekend limited time offers such as land expansion deals or discounted bank deals. 

Go to Add a Friend under neighbors and enter the code exactly as listed including asterisks.