Five things to do in Brooklyn this week!

Friday

Oct. 25

Got no strings

The theremin — the electronic, no-touch instrument that produces the eerie oooo-WEEEE-ooooo in the “Doctor Who” theme, is notoriously difficult to play. But tonight, Carolina Eyck, generally regarded as one of the world’s best thereminists, will both sing and play the device in honor of its 99th birthday.

7:30 pm at National Sawdust (80 N. Sixth St. at Wythe Avenue in Williamsburg, www.nationalsawdust.org). $30 ($25 in advance).

Saturday

Oct. 26

Heart of barkness

Look, we cannot resist cute animals dressed up in people clothes, and the Great Pup-kin Dog Costume Contest is the first, and still best, of the many events dedicated to adorable doggies this Halloween season. So make your way to Fort Greene Park to see more than 100 of those good, good boys! Afterwards, visit the other side of the park for a Halloween party for humans, running noon–3 pm.

11:30 am at Fort Greene Park’s Monument steps (Myrtle Avenue at St. Edward Street in Fort Greene, www.fortgreenepups.org]. Free.

Sunday

Oct. 27

Showtime!

After your awesome Halloween party on Saturday night, stumble out of bed on Sunday for brunch with one of the best spooky films of all time — “Beetlejuice!” Turns out that Winona Ryder’s goth teenager and Michael Keaton’s over-the-top poltergeist still hold up!

11 am at Nitehawk Prospect Park (188 Prospect Park West at 14th Street in Park Slope, nitehawkcinema.com/prospectpark). $15.

This is grape!: Fort Greene’s Peter Adams shows off his pup George in his grape costume at the annual Great Pup-kin dog costume contest, happening this year on Oct. 26.

Photo by Caroline Ourso

Wednesday

Oct. 30

Sonnet son

The year before William Shakespeare wrote “Hamlet,” his 11-year-old son Hamnet died suddenly. In the play “Hamnet,” opening tonight at the Brooklyn Academy of Music, that son gets a voice, with a single actor playing him as a 16th-century youth, a modern-day tween, and as the Danish prince who cannot decide whether to live or die. The show continues through Sunday.

7:30 pm at BAM Fisher (321 Ashland Pl. between Hanson Place and Lafayette Avenue in Fort Greene, www.bam.org). $25.

Thursday

Oct. 31

Monster march

There are plenty of places to spend All Hallow’s Eve, but make time to stop by the Park Slope Halloween Parade, which is always filled with kids in cute costumes, giant puppets, and people tossing candy to bystanders. The procession will march down Seventh Avenue from 14th to Third Street, then turn left and head to the Old Stone House.

6:30 pm, starting at Seventh Avenue and 14th Street in Park Slope, (www.theoldstonehouse.org). Free.

A ruff time: Aran Murphy plays the title character in “Hamnet,” the son of William Shakespeare, who died in 1596 at age 11. The show opens on Oct. 29 and runs through Nov. 3.

Ernesto Galan