Hi Arielle,
Since your organization is based in DC, you probably know that the League of American Bicyclists has bike education materials. Attached is a PDF file of Road 1 in Spanish (sorry it is a big file).
The Santa Barbara Bicycle Coalition has been partnering with the City of SB and other local groups to offer bilingual family bike events (called Bici Familia) to the community. They have been extremely successful because they are fun, well organized and several instructors (LCIs) are Spanish-speakers.
Photos from May 2013http://cbarreb.smugmug.com/Bikemonth/CycleMAYnia-2013/Eastside-Rides/
Photos from September 2013http://cbarreb.smugmug.com/Bikeevents/Community/Bici-Familia/
Photos from December 2013http://cbarreb.smugmug.com/Bikeevents/Community/A-Bike-4-Christmas/
Our next Bici Familiahttp://bicicentro.org/events?eventId=884777&EventViewMode=2&CalendarViewType=1&SelectedDate=5/30/2014is scheduled for May 29th and it is hosted at an Elementary School.
We have a small Powerpoint presentation I'll be happy to share to people who are interested. Please contact me directly: edu@sbbike.org
Cheers,