Hi Ralphy... I don't post here, but I've enjoyed reading what looks to be an encouraging turn of events in your sitch. I'd say just enjoy the moments as they come, no expectations. Be completely charming and on your best behavior tonight, but let her make all the "first moves." Kisses, I love you's, etc. Let her know you're happy to be with her, but let it also come across that you'd be just as happy if you weren't. (Even though I know that's a hard one to pull off.)

I hope your dinner and everything that goes with it is a great success - and hey, happy birthday!

Me: 46 Her: 41
M: 5.5 yrs / S: 20, 18
3/26 W and I meet OW
BD: 5/2/2015, she takes off ring
W goes to stay with OW 6/26
NC: 9/5 Both moved out: 10/16
I take off my ring and feel... healed: 10/19