If you are using Google Local Business Center, you may have already noticed a new feature which allows you to post messages (limited to 160 characters) to you place page:
Each message will expire in 30 days from the time it is published. If you decide to include a specific link inside the message, it will be converted into an HTML (click-able) link on your listing page see example bellow of first message from The Chocolate Belles:
You can see Chocolate Belles live listing here.
This new feature offers you an additional options to promote specific events, services or products via Google Local Business Center.
According to Post to Your Place Page FAQ – you can only have one message at a time posted to your place page.
Disclosure: I currently advise The Chocolate Belles on Internet marketing.