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Either of those is fine ("&" is just another way to write "and") and will be understood. Another formulation you'll sometimes see is "Aug 4-5, 2011", but this is better for things that are con...
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#2: Initial revision
Either of those is fine ("&" is just another way to write "and") and will be understood. Another formulation you'll sometimes see is "Aug 4-5, 2011", but this is better for things that are continuous, like a convention. I assume your presentation will be in two parts, one on Aug 4 and the other on Aug 5, and that in between you'll be doing other stuff (eating, socializing, sleeping...).