Provide customizable name tags for on-site participants

[Daniel-Mietchen]

Here's what we currently have in https://github.com/UVA-DSI/2017-doathon/blob/master/guide/on-the-day-instructions.md#arrivals :

Give people stick-on tags — in fact, give them many! To keep things visible at distance, have a tag each for:

• First name
• Contact (email / Twitter)
• Some words to spark conversation (aka metadata)

[Daniel-Mietchen]

We had name tags, and they worked fine.