It really depends, but one method is using social media. For instance, putting the information out on your Instagram story, so that everyone can see what you're thinking and then respond if they are interested. Word of mouth can work too, and especially if you show people pictures of where you go on hikes, or where you are planning on going, they are more likely to be interested.

Happy Hiking!

"Not getting to the summit is not failure, it is an opportunity to go there again."
-Kilian Jornet-