Good luck with the exhibition. It's not like print night at the camera club but a potentially prestigious event that can put your names on the map. Here's a checklist I've used to mount exhibitions for myself and other people:
Get the right gallery...accessible location, parking nearby, enough wall-space, proper lighting, suitable hanging system (rails, nails, etc, ?), adequate opening hours including nights and weekends, off hours access for hanging and demounting the show.
Sign the right gallery contract months in advance...gallery for hire?, gallery commission on sales?, what services are provided?, money up front? Leave nothing to chance.
Write and design a cogent manifesto or unifying theme that says why you are putting up pictures, why it is important, why visitors to the show will feel rewarded, etc
Write and design individual artist biographies and statements and prepare them in the form of wall plaques to go with the big wall plaque bearing the manifesto.
Write and design a catalogue (illustrated?) and pricelist for the exhibition. Everyone who walks through the show should have one!
Organise the invitation list (your friends plus the gallery's friends) for people who should attend the exhibition.
Design and print (several hundred?) invitation cards for mailing out about 3 weeks before opening night. Follow up with reminder emails, facebook, twitter, ...etc about a week before opening night.
Write, design, and promulgate press and media releases well in advance...6 months for magazines and other periodicals, 2 weeks for newspapers, 1~2 weeks for radio and television stations. Contact media personalities that may be interested or who are otherwise hurting for news. Give interviews. Hang a banner on the gallery street front.
Write an advance review or critique of the exhibition that can be run just after opening night by a journalist facing a copy deadline.
Invite a famous personality (director of the QAG for example) to open the exhibition.
Organise, design, and fund catering for the opening night crowd....from cheese, wine, and crackers to something more upmarket. Check licencing restrictions if applicable.
Have all works to be exhibited fully finished, titled, signed, immaculately framed and ready for hanging. All wall cards have to be ready too.
Keep red dot "sold" stickers to hand. Crowd psychology needs a sales icebreaker. Consider hanging pre-sold work just to get a red dot on the wall.
When the show ends take everything away quickly.
With all the knowledge gained plan the next show.......or vow never to do it again.
Again, good luck!