announce COTA-activities

Most important for a successful activation is to make it public to the community

1. you can use a private mailing-list to inform stations were you often met before in advance of your activity.

2. use a mailing list, for example cota-activations which you can subscribe directly on the cotagroup-homepage

3. place a cluster-spot for example at where you put into the comment-field the WCA-number.