AFWAW, I am glad for you and think this will be for the best...the longer you let this go the worse it will end up for you and your daughter. Have you had any luck with the name your daughter found in the computer game? If so can your friend find where he works? PERSCO will know and your CC can find out.
Do yo have an idea what you will say to your wife if she says that she wants to work on the marriage? What if she says no? What is the plan for this weekend if she says yes or no? Will she make an honest effort to try or is this just eyewash for your daughter? If you take a trip who sleeps where?
I hate to say this but you would not be the first to discover he had an STD and if she admitted four affairs in 7 months I wonder what else were you not told.
Stay calm, try to maintain your emotions, your goal if this goes further should be for her to know you are a good man, kind, loving father, and not have her last memory of you be negative. If she says no just tell her I am sorry you feel that way and cut contact with her...if OM is gone for the long weekend you will not get a much better chance to set this up...even better if your daughter doesn't want to be with her although I hate to see her having to choose one of you so try not to put her in the middle...it it so sad that she missed the concert. Did she give you a reason? Curious if the OM is back in town.
Have you decided on what you want to do...short, mid, and long term...for your personal growth. Advanced degree or another BS, something you are interested in for life after the AF? Savings goals? Probably the most common problem I see is underestimating the amount of money needed after retirement...if you are not ready do not retire before HYT.