AFTER THE WHITE HOUSE Patricia O’Toole discusses her book “When Trumpets Call” (Simon & Schuster), which traces Theodore Roosevelt’s unorthodox post-presidency life: He went on safari, made an unsuccessful bid for the Republican nomination, and then formed a third party to try again. Tonight, 5:30 p.m., New-York Historical Society, 170 Central Park West at 77th Street, 212-817-7246, $12 general, $6 seniors, students, teachers, and members.

TOUCHING THE SKY Writer Eric Nash, author of “Manhattan Skyscrapers” (Princeton Architectural Press), discusses the early development of skyscraper style. Tonight, 6:30 p.m., Skyscraper Museum at the Center for Architecture, 536 La Guardia Place, between Bleecker and West 3rd streets, 212-968-1961, free.

REPORTER’S PRIVILEGE The PEN American Center presents a discussion, “Jailing the Messenger: Leaks, Sources, and Freedom of the Press.” CNN analyst Jeff Greenfield moderates the discussion between professor Ronald Dworkin ; journalists Anthony Lewis and Helen Zia; the editor in chief of Time Incorporated, Norman Pearlstine, and writer Vanessa Leg get, who was cited for civil contempt of court in 2001 for refusing to divulge her sources for a book on an unsolved murder case. Tonight, 7 p.m., Baruch Performing Arts Center, Engelman Hall, 55 Lexington Ave., between 24th and 25th streets, 212-334-1660 ext. 107, $10 general, $5 students and members.

BEATNIK BUILDINGS A Pratt School of Architecture associate professor, Alessandra Ponte, joins the editor of the Architect’s Newspaper, William Menking, for a discussion on the “Architecture of the Counter-Culture.” Tomorrow, 7 p.m., the National Arts Club, 15 Gramercy Park South, 20th Street east of Park Avenue South, recommended reservations atinfo@interboropartners.com, free.

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