Naturally, Yoshitaka was inviting Charlie and Claire to the main table mainly because he didn't want Kathleen to think he was mistreating her friends when she arrived later.
After all, Charlie and Claire were important enough that Kathleen had immediately changed her mind about not coming to this party. As such, when she arrived and saw them being sat at some fringe corner, she might have some choice words for Yoshitaka.
For Charlie's part, he definitely understood Yoshitaka's reasoning.
He really wasn't interested in Tanya, but his wife was a fan of her songs, so to meet her idol and even talk to her personally was always a rare opportunity.
Yoshitaka was certainly relieved that Charlie had said yes, and he quickly smiled, "Alright. Please follow me, Mr. and Mrs. Wade!"
"Wait a second," Charlie suddenly said as he pointed at Loreen and Sachiko. "There's actually four of us."
Yoshitaka quickly nodded. "Why, yes, you're right! Apologies for my negligence. Do come with me!"
Still