The OK Ornithological Society will be having its spring meeting at Hackberry Flats April 30 - May 2. It's too bad I will be out of town (Lubbock that weekend.) I am not a member of the OOS, but the meeting is so close, I would definitely go if I was going to be in town.
The price is right ($30 for non-members) and it's a good chance to improve birding skills with more experienced birders and get to know some good birding spots.
For more information and to register, go to the OOS website.