How many of our characters have mounts?
Percivilis and Jerivan's mounts are medium encumbered, so they travel at a speed of 35', so it would take a little over 2 hours to reach the campsite on horseback (without hustling).
If the rest of the party is mounted, then getting there this evening is doable, if it is on foot, then it probably won't happen, the 20' move party members will take ~ 4 hours.