When a property accomplishes a nearly 70 percent increase in sponsorship revenue in one year, the assumption is that it must have made a series of major overhauls involving its sales approach, inventory, even personnel. But Baltimore’s Artscape festival achieved such success this year by taking a few fairly easy steps, many of which had to do with tying sponsors more directly to relevant programming of the city-produced July arts festival.The free, three-day event, which attracts about a h...