Backstory:
We have a website for a conference. As part of the process of the conference, we invite people to submit sessions, but only for a limited period of time. We want to alert visitors to the site that this period is now open, and prompt them to submit a session. We were thinking of something along the lines of "breaking news" on news sites.
Currently, we have a banner that appears as part of body of the main site (see here for the real site), but it is a bit ugly. There has also been some criticism of it as being too "in-your-face". We have tried something more toned down, but it doesn't really stand out enough from the rest of the elements on the page.
Question:
How can we add something to the site that draws a visitor's attention, without it being too overbearing? Is there an approach that is commonly used that would be more suitable for this kind of thing (e.g. a growl/toast/popup of some sort)?