Get some pure, local maple syrup – and watch it get made. Groundwork Somerville’s annual Maple Syrup Project Boil Down is for anyone who wants to watch and learn how to take sap from local maple trees and boil it down into pure maple syrup over a warm fire – or for anyone who just wants to taste pure syrup on its own or on waffles, drink hot cocoa donated by Taza Chocolate and Whole Foods Market and enjoy music by The Pennies. There are activities just for kids, T-shirts for sale and a table for seed order pickup from the center’s fundraiser.

The boil down runs from 10 a.m. to 2 p.m. Saturday, rain or shine, at at the Somerville Community Growing Center, 22 Vinal Ave., Somerville.

See the world premiere staging of “Operation Epsilon.” Near the close of World War II, the Allies captured Germany’s top 10 atomic scientists and held them in a lavish estate in England, listening in to learn what they knew of the U.S. and Nazi weapons programs. What’s so cool about Alan Brody’s script is that it’s based on actual transcripts of secretly recorded conversations.

Central Square Theater selections have often shown a scientific and historic bent. In “Operation Epsilon,” which runs through April 28, The Nora Theatre Company and Catalyst Collaborative@MIT, playwright Brody and director Adam Sandberg look at the ethics of pursuing scientific discovery when it can result in catastrophic consequences.

The play shows at 3 and 8 p.m. Saturday and 2 p.m. Sunday at the Central Square Theater, 450 Massachusetts Ave., Central Square. Tickets are $15 to $50 depending on seat location and showtime and are available online.

Meet the trash fish in a gourmet setting. (If you can get in.) It’s pretty well known that much of the fish we eat is not the fish we think it is – and while we focus on high-class fish such as tuna or swordfish there’s plenty of “trash fish” that can be just as good anyway. So we may as well be properly introduced. At this “Trash Fish Dinner: The Best New England Seafood You’ve Never Tasted,” nine chefs from as close as Cambridge and as far away as Charleston, S.C., will show what can be done with such also-swams as the scup, the sea robin and the dogfish. (Chefs include Michael Scelfo, of the Russell House Tavern in Harvard Square, and Michael Leviton, chef/owner of Lumiere and Area Four, the host restaurant.)

It’s at a gourmet price – $125 per person – that benefits the work of the Chefs Collaborative, a nonprofit network of chefs devoted to sustainable food. Get on the waitlist here. The meal runs from 6 to 10 p.m. at 500 Technology Square, Kendall Square.

Celebrate Bulgarian Liberation Day with food and dessert. The national holiday of Bulgaria, Liberation Day, is actually March 3 – starting in 1878, that is, when the Treaty of San Stefano restored Bulgarian freedom after five centuries of Ottoman rule – but the Bulgarian community at the Massachusetts Institute of Technology has chosen this weekend to celebrate. Along with the traditional red-and-white martenitsi threads and tassels, organizers are tying it to Friday’s International Women’s Day, which the students say is widely celebrated in Bulgaria, and throwing in recognition of an ancient spring holiday observed March 1 for good measure. Bulgarian food and desserts will be cooked, then enjoyed from 2 to 3:30 p.m. Sunday, and the organizers invite participants to come any time after 1 p.m. to help in the kitchen. No experience is necessary.

RSVP here to be on the guest list so you can get into Ashdown House, the 235 Albany St. host of the event.

Talk “Bartleby” and “Secretary.” Or would you prefer not to? How great is this? The Classic Books Discussion closing out the weekend at The Democracy Center pairs Herman Melville’s “Bartleby the Scrivener: A Story of Wall-Street” (1853) with Mary Gaitskill’s “Secretary” (1988), linking two indifferent and even recalcitrant workers whose jobs nonetheless become vital to their lives. Bartleby is famous for saying he “would prefer not to,” whatever the suggestion, and “Secretary” is most famous for a somewhat brighter filmed version with Maggie Gyllenhaal and James Spader, but both have more going on. It may be too much to expect the topics of book discussions to be witty, but whoever organized this event has a talent.

The talk runs from 7 to 8:30 p.m. Sunday at The Democracy Center, 45 Mt Auburn St., Harvard Square.