I'm so happy to hear that there is more interest in executing another off-season event in New England, it is a challenging task but definitely worth it. For my High School Capstone Project I executed a VEX Event, so I've been through many of the same hurdles.
Let me start out by saying there is a lot of details to organizing an FRC event, even for an off-season that has a lot of the details paired down. It also takes a lot of work, so while you would be leading it as your project, you will certainty need others help in the planning as well as the execution. I highly recommend reading this guide:
http://www.usfirst.org/sites/default...n%202 %29.pdf
To answer your questions though:
1. Talk to your RD (Who I can get her contact info for you) and she can help assist in gauging interest. While getting interest in another off-season is never an issue, getting teams to your event will also come down to when you decide to host the event, and what other off-season events in the area are happening at the same time.
2. It depends on whats available to you. Venues capable of hosting FRC events aren't easy to find. Like you mentioned you need to have ample parking, easy access, and you need to have the square footage for a field and pits. All standard Hockey Rinks have the floor space to host an FRC Event, but like you mentioned, you need to make sure it is covered.
3. Costs, vary. Major charges include Field Transportation (Rental typically is free but you have to pay for the logistics), venue rental and fees, paying to feed your volunteers, game operation materials, AV, as well as typically reimbursing expenses for an FTA.
When you pay all depends on your vendors.
FRC events are tricky to make money. Normally teams don't really profit off of the event itself, but can make money off of merchandise sales and food sales.
4. YES YES YES. WIWI is a huge outreach tool for 1071, and is what really helps make our community aware of what FRC is.
If you have any questions, please don't hesitate to PM me. I've been through planing and executing FRC events many times and am willing to share any knowledge I have.
Wishing you all the best!