I learn from my mistakes. One of the rules of event photography is always thoroughly test equipment before the event. Yours truly was too lazy to put a brand new 32 Gb card through its paces before CT Wings & Wheels shoot, and sure enough, the card failed and took good 80% of pictures. The previews of CR2 files indicate that files are ok, but the files themselves are corrupted.
Here are the few shots i was able to recover and pull off the previews: