"LHC collisions present no danger and that there are no reasons for concern. Whatever the LHC will do, Nature has already done many times over during the lifetime of the Earth and other astronomical bodies." (link)
Here's a video from CERN about the LHC, explaining how it works.
This link takes you to the web page of the LHC. You can read about the schedule, the design, and updates on the operation.
This video is an introduction to CERN.