For each city you visit often, list the first five people you'd tell you're in town, and log where your top contacts live.
The idea
When I travel I have two modes. Either I sneak in and out without telling anyone, or I spend weeks lining up every breakfast, lunch, dinner and coffee. If you want the second mode, keep a Fly In List. I used to push for collecting every detail on people. Now I'm more realistic: the more work you give yourself, the less likely you are to do anything. So capture what serves the job, which here is knowing who's where.
How to do it
List the places you visit often or plan to visit.
Under each, write the first five people you'd let know you're in town.
Spend a few minutes a day logging the current city of your top relationships (your A's and B's) in your CRM.
When a trip comes up, open the list instead of fumbling through LinkedIn at the last minute.
Example
I wrote the post on the way back from Mexico City, a sneak-in-and-out trip where the kids' demands for pools, playgrounds and ice cream left no window for a matcha or taco meetup. When you do want to see people, the list is how you seed your social calendar between wheels down and wheels up.
Watch out for
Overbuilding it. Five names per city is enough to start.
The A-List Essentials: For your top people, decide what you'll actually use (birthday, address, family names, outreach interval), then fill in only that, before building fancy tags.
A/B/C Spheres: Sort everyone into three tiers by gut feeling (love, like, don't know) and spend more time on A's than B's, and more on B's than C's.
CAPITAL: Timely Engagement: The T in CAPITAL. Give each group of people a fallback rhythm, then react to events, so prioritized relationships never quietly fade.
The Channel Switch: Respond on a different channel than the one the news came through: a LinkedIn post gets a text, an email gets a call.