Gotcha, Jo. I see why you invited him. I was intending to do the same - dinner out, but with S5. She's not there yet in terms of doing things together for him. In fact, it seems MIL/FIL and IC have convinced her that this would be 'cruel' to him. What hogwash! Anything to justify self-centeredness. In many ways, your H seems much more evolved in terms of independent thought and action.
Your plans are excellent! I like your setting up fun travel plans and holiday plans so that they are possible and so that you can look forward to them.