Networking with your peers and networking up the food chain require different rules. 

Both Sides of the Table: Never ask a busy person to lunch, 2011-Oct-13, by Mark Suster

First date, speculative meeting: I always recommend you ask for coffee. And better if it’s at their offices if you’re asking for the meeting. “Hey, can I bring you a coffee and get 30 minutes of your time at your offices next Tues or Wed? I promise I won’t overrun my time.” And don’t. You become an easy second date to accept.