If you meant having a signature campaign on the forum and not an actual community like bitcointalk, there is one, unfortunately, the signature campaign is on hold. On the other hand, creating a forum community solely for JacksClub.io will not gain much traction in terms of advertising and it would cost them a lot of resources such in terms of paying annual domain name, cost for bandwidth and webspace etc.. It would do more harm than good. One thread and a few more contest held in bitcointalk itself is enough to get an attention.

As per the contests, JacksClub.io is currently running a few different wagering contest in their website. Check that out.