Promotion extensions are now available for Microsoft Advertising accounts, but only in the US. These extensions will allow you to select from events or occasions such as Christmas, Black Friday or Cyber Monday.
Microsoft said that:
“Promotion Extensions allow you to highlight a special offer or a special deal in your text ad. Additionally, you can tie your deal to a holiday or special occasion.”
Users can access Promotion Extensions on PC, tablet, and mobile ad experiences.
Source – Microsoft Blog