What are rituals good for? What makes a good ritual? What are the dangers of rituals? Are they worth it?

This being the solstice, conditioning on a "yes" to the last question, we may end up doing some of these ones: https://dl.dropboxusercontent.com/u/2000477/SolsticeEve_2012.pdf

The location is 300 S Goodwin Ave Apt 102, Urbana Illinois. The main entrance to the building requires card access, but there is a door directly to my apartment from the outside at the Northwest corner of the building. If you have any trouble getting in, call my phone, REDACTED