How can I get my facebook group noticed?

[engage]

I'm trying to get people to join a adventure expedition group for camping hiking and offroad on facebook within two states. I've made posters, and even have a decal on my car. I've reached out to my own friends list and others have helped brought people from theirs, the page itself is well put together and I even Photoshop a nice inviting banner at the top. Im just looking for more ways to get noticed online. Like do hashtags work like on instagram? is there a free online service that can get me noticed? thx https://www.facebook.com/groups/wocho/
An no nisia this is not spam the link is there so you can see

[Nisia]

SPAAAAAM