Many thanks to SWLing Post contributor, Andrew Yoder, who writes:

Just a reminder that the next Global HF Weekend is coming up: March 30-April 2, 2017

Finnish DXer Harri Kujala started the weekends (the 1st weekend of April & the 1st weekend of November) about five years ago & I said I’d write about them. The idea was for listeners in faraway areas to be able to hear broadcasts that normally would not be audible (or barely so)–all while promoting cooperation among those in the hobby. In those first GFWs, some transatlantic QSOs were established and stations from Europe & North America were reported in Russia, India, Ukraine, Japan, and other countries.

I’d expect that some stations will post schedules on HFU. I’ll also be tracking the broadcasts and schedules on my blog, so if any stations send schedules to me, I’ll post it, but without the station name: just date, time, frequency. This will be especially handy for those stations who choose to operate outside of Harri’s suggested 19m and 13m frequencies. Given the lack of sunspots and the low solar activity, 9, 11, 13, and 15 MHz might be better choices than 21 MHz.

Here’s the rest of the general info:

March 30-April 2, 2017
General frequency ranges:
15010-15100 kHz
21455-21550 kHz

Basic schedule:
European morning, 0800-1200 UTC from Europe to Asia/Japan/Oceania.
European afternoon, 1200-1600 UTC from Europe to North America and vice versa.
European night, 2200-2400 UTC from North America to Asia/Oceania.

Of course, these are general frequency ranges where pirates have broadcast during prior Global HF Pirate weekends. Some stations will surely operate on frequencies and times outside of these ranges. These will be updated on HF Underground (https://www.hfunderground.com/) and on the Hobby Broadcasting (http://hobbybroadcasting.blogspot.com/) blog as it happens.