Critique: Review all of the mockups/plans. Narrow down options. Consider new ideas (do some collaborative sketching).
Develop a plan for next steps. Build out a reasonable timeline. A basic/functional version of the site (that matches the brand guide) needs to be up for Blitz week that starts on 9/24. Progressive enhancements could be added on through 10/3. During the progressive enhancement phase you can make revisions based on user-testing and quality testing.
Nominate a project manager to keep the group on task during class meetings and to keep all of the paperwork in order: copyright documentation, changelog, timesheets. This person should be very organized, never miss deadlines, and proactive.