After lunch, I asked her if she wanted to come back to my place and have some drinks (we're both 25), but then she hurried off to the bathroom, and I didn't see her again. What did I do wrong?[/quote]
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Any girl that went off to the bathroom while on a date and did not come back is not worth her salt and she did you a big favor (she's an AH). You did not do anything THAT wrong.
I have gone to track meets as dates myself a couple times*(not the first date).
She probably was turned off by your asking her to come back to your place on the first date. I ask that from time to time on first dates and generally I have to explain to her why a girl would come back to my house on the first date.
ALWAYS give them the simultaneous option to go somewhere else besides your house when you ask--make it one of several options. It will make them feel more comfy and allow them to make the decision to come to your house or at least keep it on the table. Then, you have your answer and the girl feels more comfortable.
Now go out and better that 4:41 PR.