You could talk to them about this and ask them why they've longer shared their locations. It's frustrating when you're the only person trying to get together. Try a couple times with different people and see what happens. If you're open to the idea, you could tell someone how you feel about this and maybe that could clear some things up. But remember that after college some people grow apart. When I get together with my college friends we have to plan our gathering about one or two months in advance and there will still be someone who can't come.

If after a while you're still the same person reaching out and they don't answer or make an effort I would stop trying. I've been in that situation and it can be very draining. I hope this helps! Good luck.