@Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + (description != null ? description.hashCode() : 0);
        result = 31 * result + (startTime != null ? startTime.hashCode() : 0);
        result = 31 * result + (endTime != null ? endTime.hashCode() : 0);
        result = 31 * result + (attenders != null ? attenders.hashCode() : 0);
        return result;
    }