Of course! Nix hounds do come in packs! Note that these ones are, for the most part, rather emaciated and not really in a mood to fight - but as you say, they might like the smell of fish!
So, as far as I see it time-line-wise:
Midday-ish of Day 1 - Murzuth & Thorlda brief the group.
Afternoon, evening (?) of Day 1 - people mill about camp, get to know each other, etc.
Evening of Day 1 - Murzuth signs out.
~Stuff happens - up to you! Fish supper, cliff racer fight, nix hounds in the camp, etc.~
Mid-morning of Day 2 - people head off. Probably.