Post-Grad Networking Outside Smaller Finance Hubs: Seattle, San Diego, Dallas

I just graduated and joined at $1B healthcare VC fund that has multiple offices including one in New York/Connecticut. I'm the only analyst at the firm for about12 partners/principals. However, I happen to be based physically in a smaller finance hub - think San Diego, Seattle or Dallas. I networked extensively last summer, and interviewed with bulge bracket banks and MBB for consulting.

There are almost no finance professionals around the same age as me in my sub-sector, and extremely few in the area. I've basically lost touch with my network from last summer since I'm not so relevant now that I'm not looking for internship or job advice.

I'm wondering if anybody has some tips on how to maintain a network in the main finance hubs when you're not in one of the main hubs, and not in a sufficiently senior role to travel that frequently. I'm concerned that when it comes time to move onto my next role (ideally in a large finance hub) that I'll have a limited network to tap into, and have to resort to cold-calling, or relying on my boss' network (which limits my flexibility in the timing of my departure) or recruiters.

It's not the same situation as going down for a weekend in NYC and meeting a lot of bankers for an analyst or summer analyst job. I'm pretty sure that won't be effective. I already have a job, and I just want to keep a discreet eye out for promising opportunities in the right geography. When I was interning during my summers in one of the large hubs, it was easy to go out to lunch with MDs and VPs from banks or other healthcare finance analyst. Impossible now. Any suggestions?