Oz hardly thought his best mate wanted to discuss anything with his sister, but given that he had was equally reticent to do anything that campaign managers were actually meant to do, perhaps it could be arranged. In any case, Christabel didn't seem to be pausing to discuss the matter — she was off towards the floo already.
"Host a dinner party for us, then," he called after her. The places he typically entertained were either unsuitable to the purpose of serious conversation (the ballet, or the Dempsey house itself with his sibling's proclivity towards interrupting anyone's business) or wouldn't have admitted her (the gentleman's club), so if she wanted the pair of them together for conversation she'd have to provide the venue herself. Presumably if he won he'd need a better place to entertain, he thought — but only idly, as the idea of winning the election had never yet seriously occurred to him.
"Host a dinner party for us, then," he called after her. The places he typically entertained were either unsuitable to the purpose of serious conversation (the ballet, or the Dempsey house itself with his sibling's proclivity towards interrupting anyone's business) or wouldn't have admitted her (the gentleman's club), so if she wanted the pair of them together for conversation she'd have to provide the venue herself. Presumably if he won he'd need a better place to entertain, he thought — but only idly, as the idea of winning the election had never yet seriously occurred to him.

MJ is the light of my life <3