Even though I agree with the saying "trust no network", I do also agree that there should be some degree of security (or difficulty to access certain information).
The suggestion is that the WiFi password be changed every who knows when (month? two months? random?), print and place the password and its QR Code at some wall inside OC. How to create the QRCode on Linux:
qrencode -s 9 -l H -o "OmniCommons-WiFi.png" "WIFI:S:OmniCommons;T:WPA2;P:SuperPasswordGoesHere;;"
IMHO, it will reduce the openness and make a bit more difficult to just anyone from the street scan/etc the network.
Last time I checked the OmniCommons WiFi signal reaches about half block away from the building, going north on Shattuck Ave.
Thanks.