(We wouldn’t normally link to Wikipedia, but) Here’s a good outline of the structure of Invisible Cities…
Resources for submission 1 (30%) are available here:
Choose one of the Invisible Cities from the filtered list in the poll linked here: doodle.com/na5v6g565qsh95vp
The poll is there to make sure that you don’t do the same city as someone else.
Submission 2 (70%) resources will be available soon