The CLS call for proposal is open twice a year.  The timelines can be accessed in the following link 
CLS Proposal application timeline

2. Contact the beamline staff prior to submitting the proposal 

The beamline scientist or the PEEM Research Associate should be contacted prior to submitting the proposal.

Beamline Scientist (for STXM) - Jian Wang OR Jay Dynes

Beamline Scientist (for PEEM)- Jian Wang 

3. Creat and manage your proposals

How to creat and manage your proposals can be found at the related CLS website.