There have been twenty previous editions of Schlafly's Hop in the City, so you know the deal. You buy a tasting ticket, you get to sample more than 40 beers, plus four specially brewed beers, and there will be food and a couple bands. For year 21, there have been some important changes to the tried-and-true method. Tasting tickets are limited this time around, to keep the festival grounds from being overcrowded. The layout has also been reimagined so the lines should be more manageable, with more shade and seating available and greater quantities of each beer to safeguard against running out. Hop in the City takes place from 11 a.m. to 4 p.m., with tasting time starting at noon on Saturday, September 14, at the Schlafly Tap Room (2100 Locust Street; www.schlafly.com). Tickets are $35 to $40, and if you're not into samples, you can buy singletons from Schlafly's regular beer menu.