9 a.m. to 3 p.m.: Mercer Regional Chamber of Commerce Business Expo; Trenton Marriott Hotel. For information, call Joe Zoratti at (609) 689-9960, ext. 19.
11 a.m., 12:30 p.m., 2 p.m.: Estate Park and Nature Tour, Duke Farms, Hillsborough. Also Thursday through Sunday.
7 p.m.: Talk with Oleg Grabar, author of The Dome of the Rock; Princeton University Store.
7:30 p.m.: Netherlands’ Teatro delle Stelle production of The Princess Who Went to the Heart of the Earth; Waldorf School of Princeton, 1062 Cherry Hill Road.
8 p.m.: Translations; McCarter Theatre. Also Thursday at 7:30 p.m., Friday at 8 p.m., Saturday at 3 and 8 p.m., Sunday at 2 and 7:30 p.m.
8 p.m.: Japan’s NHK Symphony Orchestra with Pianist Hélène Grimaud; State Theatre, New Brunswick.
8 p.m.: The Things You Least Expect; George Street Playhouse, New Brunswick. Also Thursday at 8 p.m., Friday at 8 p.m., Saturday at 2 and 8 p.m., Sunday at 2 and 7 p.m.
11:30 a.m.: Annual YWCA Princeton Friends’ Luncheon, with Ellyn Spragins, author of What I know Now: Letters to My Younger Self; Cherry Valley Country Club, Skillman. For reservations, call (609) 497-2100, ext. 333.
12:15 p.m.: The Franklin Strings, Niles Chapel, Nassau Presbyterian Church. Free.
4 p.m.: Talk with Pamela Porter, author of Sky and The Crazy Man; Princeton Public Library.
5:30 p.m.: Arts Council of Princeton acoustic jazz concert with Luke Elliot; Quark Park, Paul Robeson Place. Free.
6 p.m.: Fourth Annual Crawford House Humanitarian of the Year Gala; Grounds for Sculpture, Hamilton.
7 p.m.: Talk with David Billington, author of Power, Speed, Form: Engineers and the Making of the Twentieth Century; Princeton University Store.
7:30 p.m.: Regional Planning Board of Princeton; Township Municipal Complex.
8 p.m.: Second Line; Mill Hill Playhouse, Trenton. Also Friday and Saturday at 8 p.m., Sunday at 3 p.m.
8 p.m.: Princeton University Players’ The Last Five Years; Matthews Acting Studio, 185 Nassau Street. Also Friday and Saturday at 8 p.m.
8 p.m.: Pridonoff Duo; Mildred & Ernest E. Mayo Concert Hall, The College of New Jersey, Ewing.
8 p.m.: Theatre Intime’s Equus; Hamilton-Murray Theatre, Murray-Dodge Hall. Also Friday at 8 p.m., Saturday at 2 and 8 p.m.
8 p.m.: Princeton University Orchestra; Richardson Auditorium.
2 to 5:30 p.m.: Friends of the Princeton Public Library Book Sale; Community Meeting Room, Princeton Public Library. Also Saturday from 9 a.m. to 5:30 p.m., Sunday from 1 to 5:30 p.m.
7:30 p.m.: Vijay Iyer Jazz Quartet; Berlind Theatre.
7:30 p.m.: Joe R. Engle Organ Concert with organist Hans Davidsson; Miller Chapel, Princeton Theological Seminary. Free.
8 p.m.: Dracula: The Musical; Kelsey Theatre, Mercer County Community College. Also Saturday at 8 p.m., Sunday at 2 p.m.
8 p.m.: Dance Improv movement workshop; All Saints’ Church.
8 p.m.: Princeton-Harvard Glee Clubs; Richardson Auditorium.
8 p.m.: Westminster Symphonic Choir; St. Paul’s Church, 214 Nassau Street.
8 p.m.: Dave Brubeck Quartet; State Theatre, New Brunswick.
8 and 10:30 p.m.: Comedians Artie Fletcher and Eric Tartaglione; Catch A Rising Star Comedy Club, Hyatt Regency Hotel. Also Saturday at 8 and 10:30 p.m.
8:15 p.m.: Princeton Folk Music Society concert with singer-songwriter Bob Zentz; Christ Congregation Church.
2 and 8 p.m.: Lindbergh and Hauptmann, The Trial Of The Century; Hunterdon County Courthouse, Flemington. Also Sunday at 2 p.m.
7 p.m.: The Darla Rich Quintet; Hopewell Valley Bistro, Hopewell.
7 p.m.: Singer David Sancious, Raks Odalisque dance troupe, and Ballet-Folklórico de Princeton; Quark Park. Free.
8 p.m.: Concert, Ian Anderson Plays Orchestral Jethro Tull; State Theatre, New Brunswick.
8 p.m.: Princeton University Orchestra; Richardson Auditorium.
3 p.m.: Benefit recital with mezzo-soprano Joan Waite, Spirituals and Songs of Love: Mozart to Stevie Wonder; Unitarian Universalist Congregation of Princeton.
3 p.m.: Ensemble Solage; American Boychoir School, 19 Lambert Drive.
3 p.m.: New Jersey Symphony Orchestra; State Theatre, New Brunswick.
4 p.m.: Princeton Symphony Orchestra; Richardson Auditorium.
7 p.m.: Praising Hands Choir concert of contemporary gospel music for the hearing impaired; First Presbyterian Church, Plainsboro.
1:30 to 7:30 p.m.: American Red Cross Blood Drive; Central New Jersey Chapter, 707 Alexander Road. Also Tuesday through Thursday from 1:30 to 7:30 p.m.
5:30 p.m.: Arts Council of Princeton jazz/rock/blues concert with Back Porch Swing; Quark Park, Paul Robeson Place. Free.
6:30 to 8 p.m.: “God and Politics” Seminar Series, God and International Relations, with Amb. Robert Seiple, Institute for Global Engagement founder; Erdman Hall, 20 Library Place.
8 p.m.: Composers’ Ensemble at Princeton; Taplin Auditorium, Fine Hall. Free.
8 p.m.: The Things You Least Expect; George Street Playhouse, New Brunswick. Also Wednesday at 8 p.m., Thursday at 2 and 8 p.m., Friday at 8 p.m., Saturday at 2 and 8 p.m., Sunday at 2 p.m.
7 p.m.: Talk by Robin Levinson, author of Reyna and the Jade Star; Barnes & Noble, MarketFair, Route 1.
7:30 p.m.: Susan Tedeschi Band and Derek Trucks Band; Richardson Auditorium.
7:30 p.m.: Township Zoning Board of Adjustment; Township Municipal Complex.
8 p.m.: Translations; McCarter Theatre. Also Thursday at 7:30 p.m., Friday at 8 p.m., Saturday at 3 and 8 p.m., Sunday at 2 p.m.
8 p.m.: Friends of Music at Princeton concert with baritone Lee Gregory; Taplin Auditorium. Free.
Noon: Films with a Bite series, Gates of Heaven; Princeton Public Library.
Noon: Talk, “Too Many Cameras or Too Few? Photography in the Age of Terrorism,” by Richard B. Woodward of New York Times; Communications Building, Mercer County Community College, West Windsor.
5:30 p.m.: Arts Council of Princeton concert with Youth Orchestra of Princeton; Quark Park, Paul Robeson Place. Free.
6 p.m.: Princeton Family YMCA Executive Club’s 45th Annual Dinner, with guest speaker James D. Wolfensohn; Princeton Family YMCA, Paul Robeson Place. For tickets, call (609) 497-9622, ext. 210.
7 p.m.: Talk, “Succeed on Your Own Terms,” with Herb Greenberg and Patrick Sweeney of Caliper Management Consulting; Barnes & Noble, MarketFair, Route 1.
7:30 p.m.: Country music stars Brad Paisley, Carrie Underwood, and Jake Owen; Sovereign Bank Arena, Trenton.
8 p.m.: Second Line; Mill Hill Playhouse, Trenton. Also Friday and Saturday at 8 p.m., Sunday at 3 p.m.
6 to 9 p.m.: Halloween at the YMCA, with face painting, pumpkin decorating, moon bounce, ghoul room, cookie decorating, crafts, movies, and more; Princeton Family YMCA, Paul Robeson Place. Free.
7 p.m.: Jazz concert with Joe Zook & Blues Deluxe; Trenton City Museum at Ellarslie Mansion, Cadwalader Park.
8 p.m.: New Jersey Symphony Orchestra; Richardson Auditorium.
8 p.m.: Friday Night Live teen-only entertainment event; Princeton Public Library.
8 p.m.: Dracula: The Musical; Kelsey Theatre, Mercer County Community College. Also Saturday at 8 p.m. and midnight, Sunday at 2 p.m.
8 p.m.: Riverside Symphonia; St. John the Evangelist Church, Lambertville. Also Saturday at 8 p.m.
10:30 a.m.: Word for Word book club for children ages 9 and 10; Princeton Public Library.
11 a.m.: Annual Halloween Parade and Contest; Princeton Shopping Center Courtyard.
11 a.m. to 4 p.m.: Second Annual Festival of the Guild for Early Music; Grounds For Sculpture, Hamilton.
2 and 4 p.m.: From the Mixed Up Files of Mrs. Basil E. Frankweiler; Kelsey Theatre, Mercer County Community College.
7 p.m.: Tony Mennella and Dick Braytenbah Trio; Hopewell Valley Bistro, Hopewell.
7 p.m.: Jazz piano with Tara Buzash; Hopewell Valley Vineyards, 46 Yard Road, Pennington.
7:30 p.m.: A Choral Tapestry with Westminster Chapel Choir and Westminster Schola Cantorum; Princeton High School Performing Arts Center.
8 p.m.: Olivia Newton-John; State Theatre, New Brunswick.
9 p.m.: Guitarist Andru Bemis; Cafe Improv, ConTEMPORARY Arts Center, Princeton Shopping Center.