You can generally refer to anything you want as long as you adhere to the rules about not being offensive. Rule #3:

The problem with promoting outside giveaways is the liability. We don’t want to have to defend, be questioned or even respond to individuals questions about your promotional content.

We don’t want to be associated to what theGrid members are promoting. Based on how our own giveaways have gone we get a lot of messages with questions about the legitimacy of the organization and the giveaways.

We would like a layer of separation which would be a separate landing page with your own privacy policy, terms of service, rules, support and contact information.