I think I have to agree with Miko: don't set the date too far in advance.
Here's what ended up happening. We started sending flirty texts, so things picked up better than I had hoped for. She told me where she worked and I showed up randomly two days before the date (while things were still hot). It was a ballsy move because it could have bordered on stalker-ish, but I knew it wouldn't be weird in this particular situation. The rest is history.
What I learned from the experience was that if things are done right, then it will get hot quick. And if things are getting hot you don't want a long interim for things to get stale. It's important to first figure out how often she responds. If she only logs in every two days, then ask for a date on monday, so she responds on wednesday, and then see her on friday. The time gaps are perfect there. Don't ask her on thursday, so she can read it on saturday and already have plans and make plans for the following week. It's too much time; things are likely not going to be as hot and spontaneous. But, as always, it depends on the situation.
Also, I learned that spontaneity and confidence can accelerate things very quickly
