Originally posted by Faceplant8:

... if a horde attacked happened unexpectedly in the field. ...

Except for being hunted events only happen near certain player built structures (crafting stations, fires,) so all you're doing is encouraging them.

Originally posted by Faceplant8:

... overnight shelter in the plains while searching for Yagluth. ...

You'll want to get used to night plains before taking on Yagluth anyway, it's a long fight and will probably go into the night.