Two healthy debuts — one for the musical adaptation of “A Bronx Tale” and one for Kristin Chenoweth’s  — helped keep the Broadway box office steady last week in the face of the New York City marathon, which can sometimes dampen sales.

Buoyed by a familiar title and a link to the well-known name of Robert De Niro (who co-directs), “Bronx Tale” ($324,821 for three previews) earned more than $100,000 per performance in a relatively small house, drawing crowds that averaged 96% of capacity. That makes for a promising start for a show that opens Dec. 1.

Also earning strong numbers last week was “My Love Letter to Broadway” ($851,694 for six), which benefits from the appeal of Broadway favorite Chenoweth paired with material that’s catnip for her theater-loving fans. She’ll play five more performances in the coming week for the limited engagement.

With the continued robustness of “Natasha, Pierre and the Great Comet of 1812” ($1,025,106), the overall Broadway cume upticked a bit in a week that can sometimes slip in the face of the New York City marathon — which typically packs local hotel rooms with more athletes than theatergoers. Most gains and losses at individual titles seemed relatively minor, and the overall trend was upward, if not by a lot. Total sales inched up to $25.4 million for 31 shows now running.

Among some of the recent additions to the boards, “Falsettos” ($600,206) gained noticeable steam following its strong reviews, and “Les Liaisons Dangereuses” ($657,991), which earned mixed notices, picked up after its opening night early last week.

Broadway may face a tough week ahead, with the election throwing off regular performance schedules and the clocks settling into daylight savings time — thought by some, thought not all, in the industry to have a dampening effect on box office. But there’s a scheduled day off in New Jersey schools this week, plus Veteran’s Day, which might spur a little extra business.