Kobayashi-san Chi no Maid Dragon: Okomorigurashi no Fafnir - Vol. 1 Ch. 7 - Fafnir and Comiket (Event Arc)

[MangaDex]

 

[FlowerSlaughter]

And here the spin-off ties directly into chapter 17: Tooru and Comiket.
On one hand it's great, on the other the main series is on chapter 135, there's lot of catching up for the series to do.