Junior Days do not make or break your being recruited.
If you choose not to go because of cost, send a letter to the coach explaining why you couldnt attend but reiterate your great interest their program.
Definitely attend ones locally. Coaches understand if you have to travel great distances and choose not to attend.
There is no private conversations with the coaches so dont expect anything more than being in a large group of early recruits herded around the campus.
It's a great sign you are on their radar. But, where you will fit into their recruiting needs still needs to determined.
Keep working hard this is the spring/summer you have been waiting for!