We often get ad copy change requests from clients wanting to showcase a sale or short-term promotion. While we may accommodate these requests from time to time, there is a reason we don't recommend changing your ad copy, especially for temporary offerings.
The main reason we try and dissuade clients from these types of changes is that altering your ad copy to something unique to your location will remove your campaign from our system wide optimization process. Removing you from this might be okay in the short term but has long term implications such as decreased performance and visability.
Despite this, there are things we can do to accommodate specials and sales so be sure to reach out to firstname.lastname@example.org to talk it through with one of our representatives.