My question involves employment and labor law for the state of: California
I work for the City as an at will employee. In April of 08, my supervisor comes into my work and asks my coworker and I if we would like to work at the City's two annual summer camps, and we agree. My coworker and I had worked the camps the previous year. A couple of weeks ago, my coworker informs me that my supervisor had told her, while they were hanging out, that she was thinking of not letting me work the camps. The training began this week and I was not told of it. It seems that she decided weeks ago that I was not going to be a part of the camp. I recieved no phone calls or communication about this.
Is she in breach of an oral agreement? My coworker was present when I was asked to work the summer camps and I had been counting on working these two camps to help me through the summer (since my job is only available during the school year)

