Navigate to http://YourGalleryName.artsteps.com and click ‘Exhibitions’ in the upper right hand navigation bar to manage your gallery’s exhibitions. Click ‘Edit’ under the exhibition you wish to edit. You will be taken in the ‘Edit Exhibition’ page.
You can resume a suspended exhibition, permanent or current. After resuming it, it will be available for exploration either permanently or for a certain number of days. This would be the number of days left for your exhibition to normally end, before suspension.