I’ve finally done it; I’ve managed to pull together a lunchtime gaming group at work. We’re going to be meeting on Fridays, with the goal of getting some roleplaying in with the new edition of Dungeons & Dragons. We’ll fall back to board or card games if we don’t have quorum, just to keep the group rhythm going.
I started with the Lost Mine of Phandelver from the D&D Starter Set, which was easy to pick up and run. Mike Shea has some useful suggestions about running Phandelver.
The adventure from the D&D 5e Starter Set.
I’m going to have to think about ways to make the one-hour game session hum. The narrative combat model in D&D5e will be a big part of that. If anyone has other suggestions for making a lunch-hour RPG campaign work, please let me know.
Poppa VT 
A lunch game group would be such a great thing to have. I only just discovered within the last month there’s someone in my work place who likes to play games, at all — non-video games; there’s a lab full of electronic game-players just below my desk.
You’re welcome to join us, but it would make for a really long lunch for you.
And like hobbits, I love a lunch that verges into tea.