Khan didn't involve Luke in the recent issue, but the period gave him an excuse to prolong his stay on the planet. Monica's birthday was only three weeks away, and hosting celebrations inside the quadrant would benefit its relevance.
Except for Martha, Monica and Khan would rather spend the birthday alone, but the quadrant needed as much good PR as possible. Besides, things had finally reached the point when Khan could offer decent entertainment, so inviting lofty guests felt mandatory.
A leader's duty was to put the domain's well-being before personal needs. Khan didn't like using Monica's birthday like that, especially since her family had engaged in similar tactics, but she offered nothing but support. Monica knew her role, and prolonging Khan's authority would benefit them in the long run.