leftbelow... Congratulations! You're going to be a Daddy... that's awesome!
Should I go Sat. to the convention just to keep my mom happy and get her off my back?
No. This won't keep your mother happy or off your back -- it will only be the beginning of a constant nag to return to something you are not sold on. Do not set a precedence.
If someone defines their happiness by what other people do, they have personal issues that they need to address.
You and your wife need to discuss how you wish to raise your daughter. There is no need to be associated with any Church, imo. I find they all have their own man-made agendas, especially the WTS, that I cannot align with. I believe you have the same issues with them. So this is a personal choice between you and your wife.
My brother and his wife raised 3 incredible kids and they never went to Church. They taught them values, morals, and principles all on their own. To me, the teachings of Jesus Christ in the Bible are the foundation to this. I suggest that you and your wife design your own course of action when it comes to raising your daughter. As always, I recommend Stephen Covey's books. He has one for Families - "7 Habits of Highly Effective Families".
To have a full, positive, and rewarding life, we must focus on all 4 areas of human need: To Live (Physical), To Love (Emotional), To Learn (Mental) and To Leave A Legacy (Spiritual). Using True North Principles as one's foundation will lay the groundwork to accomplish wonderful things in life. Covey's "First Things First" is also excellent.