In Quake 3 we've seen players fight each other in all sorts of settings, but for this Urban Jam, we're bringing deathmatch to the city. You can create anything relating to or having characteristics of a town or city. Think of factories, warehouses, shipyards, construction sites, city streets, sewers, etc. If you prefer examples from other games: City 17 from Half-Life 2, Counter-Strike maps such as Overpass, almost any map from Kingpin and if you're looking closer to home, most of Urban Terror for Quake 3. The Quake 3 Urban Jam starts Friday May 30th and ends Sunday July 13th, followed by a public playtesting period. Please visit the q3-urban-jam channel in the Map-Center Discord server (discord.gg/vSvqwys5hB) for the rules and guidelines.

This is a great project and theme. Looking forward to seeing the maps from this Jam. Personally I'm already overcommitted but it has me thinking about what I would try to do.

>almost any map from Kingpin
A good example is this which used some kingpin resources (notably the skybox)
lvlworld.com/media/id:248
True Combat would also be heavily kingpin inspired (down to the swearing)