The Community bulletin board (aka WP:CBB) is a terrific way to let your newly created Portal, WikiProject, etc., be known to the community, including at the Community Portal. It's also a great way to recruit fellow editors. If you post a notice there, please follow these guidelines:
Use present tense.
Bold the main link.
Keep it short and sweet, news style.
Use pulldates (one week) by inserting them into a hidden comment like this: <!-- Pulldate: July 3 -->
Or just follow the instructions on the page, which will be visible when you edit it.
You can also submit WikiProject and similar news to the relevant section of the Wikipedia Signpost.