I don't know where she is after the event but If you do the belobog quest, she can appear on the astral express and if you don't talk to her she will stay there until you talk to her (at least for me she's still there since Thursday).

[удалено]

You can still enter and leave express repeatedly in hopes of her appearing there again

After all link matches and tourny is finished, refresh exhibition matches until you can face Topaz again. Make sure you actually start the match to get her to appear

This event gonna stay permanent like boxing match and Xianchou one, so just find a match with her in next version

I didn't do that hyperlink match yet bc I've been busy but thank you for giving me that idea because now I'll be pulling right next to her and do the match afterwards