CONCORD -- Assemblywoman Susan Bonilla, D-Concord, will join local teachers and state Superintendent of Public Instruction Tom Torlakson during a Wednesday rally for Proposition 30 in Todos Santos Plaza.

The event, called "Contra Costa Unite for Education," is from 5-6:30 p.m. in the plaza at 2151 Salvio St. in Concord. It will also include an appearance by Delaine Eastin, former state Superintendent of Public Instruction.

The Mt. Diablo school district's teachers' union -- which previously included both Bonilla and Torlakson when they taught in local schools -- is also urging its members to turn out for the rally. If the ballot measure fails, district teachers and students would lose 11 days of instruction and staff could see their paychecks cut by about 6 percent, according to the union.

Proposition 30 would prevent $6 billion in cuts to K-12 schools, colleges and universities, as well as to local public safety services, according to a news release.