As per our art competition rules, any contest without a specified end date must end within 3 months:
Contests without an advertised end date must end within 3 months. The end date can be changed or extended, but if the contest has been open for a long time without any activity from contestants or the contest holder than it may be forced closed by staff.
Forum/viewtopic.php?f=43&t=96204
Please either add an end date to extend your contest, or end the contest. Thanks!