You're welcome, Devlyn.
Some observations on what the evening revealed:
After the initial nervousness wore off, I found myself feeling very comfortable and at ease. In fact, any of the emotional detachedness that would come up when I was male seemed to be gone now.
I definitely felt happier being female than being male.
Every time someone referred to me as "she" or "her" it really felt good.
As with every time I wore girl clothes, I found I did not want to switch back when the night ended; I was really quite disappointed at having to do so.
Despite the above, I did not feel any major dysphoria when working the next day as a guy, and this confused me a lot. If I'm cis, I'm supposed to feel good about being a guy and bad about being a girl, and if I'm trans, I'm supposed to feel bad about being a guy and good about being a girl. Yet I feel more "ok" with being a guy and great about being a girl. Not sure what this means.
I do admit to feeling guilty about having met all these people and introduced myself as female, including asking them to use she/her pronouns, even though I am still questioning and don't fully identify as trans yet. I did say as much to the friends I made there, but still.
All in all, very enlightening though it still raises a lot of questions. Also, the same place is hosting a trans support group meeting this Saturday morning and an LGBT film festival that evening; I plan to attend both as my female self as well.