This gist shows you how to implement Parcelable on Kotlin classes

Event.kt

import android.os.Parcel
import android.os.Parcelable

/**
 * Created by armando on 3/9/17.
 */
data class Event(val id: Int, val name: String, val type: String, val venue: Venue? = null ) : Parcelable {

    companion object {
        @JvmField val CREATOR: Parcelable.Creator<Event> = object : Parcelable.Creator<Event>{
            override fun newArray(size: Int): Array<Event?> = arrayOfNulls<Event>(size)
            override fun createFromParcel(source: Parcel): Event = Event(source)
        }
    }

    constructor(source: Parcel):this(
            source.readInt(),
            source.readString(),
            source.readString(),
            source.readParcelable(Event::class.java.classLoader)
    )

    override fun writeToParcel(dest: Parcel?, flags: Int) {
        dest?.let {
            dest.writeInt(id)
            dest.writeString(name)
            dest.writeString(type)
            dest.writeParcelable(venue, flags)
        }
    }

    override fun describeContents(): Int = 0

}

Venue.kt

import android.os.Parcel
import android.os.Parcelable

/**
 * Created by armando on 3/9/17.
 */
data class Venue(val name: String, val address: String, var longitude: Int = 0, var latitude:
Int = 0) : Parcelable {

    companion object {
        @JvmField val CREATOR: Parcelable.Creator<Venue> = object : Parcelable.Creator<Venue> {
            override fun newArray(size: Int): Array<Venue?> = arrayOfNulls(size)
            override fun createFromParcel(source: Parcel): Venue = Venue(source)
        }

    }

    constructor(source: Parcel) : this(source.readString(), source.readString(), source.readInt(),
            source.readInt())

    override fun writeToParcel(dest: Parcel?, flags: Int) {
        dest?.let {
            dest.writeString(name)
            dest.writeString(address)
            dest.writeInt(longitude)
            dest.writeInt(latitude)
        }
    }

    override fun describeContents(): Int = 0
}