some clojure code to get some experts review it ..

trip.clj

(ns trip.core
  (:require [[clj-time.core :as t]
             [clojure.set :as set]]))

(defn default-trip
  "returns a default trip with current date as start date & end date as 5 days from now"
  []
  { :name "New Trip"
    :description "Enter your trip description here"
    :start-date (t/today)
    :end-date (-> 5 t/days t/from-now)
    :people #{}})

(defn +people
  "Adds a person to the trip"
  [trip & persons]
  (update-in trip [:people]
             into persons))

(defn -people
  "Removes a person from the trip"
  [trip & persons]
  (update-in trip [:people]
             set/difference persons))

(comment
  (-> (default-trip)
      (assoc :name "NYC Trip"
             :description "Fall trip to NYC"
             :start-date (-> 2 t/days t/from-now)
             :end-date (-> 9 t/days t/from-now))
      (+people "John" "Jason" "Krishna" "Raju"))
)