As a fun way to raise awareness about important issues facing rivers and the network of tributaries that feed into it, along with celebrating the 50th anniversary of the nationwide Clean Water Act, the Middle Susquehanna Riverkeeper Association is holding a quiz and cuisine trivia night and meal on Earth Day.

Scheduled to run from 6-8 p.m. on Friday, April 22, at the Montour Preserve near Washingtonville, the trivia portion will focus on questions developed from stories available on the association’s blog feed, which are also in the new paperback book, “Sentinels of the Susquehanna: Volume 1,” which includes more than 50 stories about a wide variety of topics related to the river and the aquatic resources that depend on it. Links to free versions of each of the stories online are below.

“Through our book and online via our blog and podcast series, we have put out hundreds of stories, investigative reports and columns about important issues and the people who passionately protect our resources,” said Middle Susquehanna Riverkeeper John Zaktansky. “We felt this would be a fun way to delve into some of those topics, have some open discussion, give out some prizes and celebrate the spirit of Earth Day.”

Tickets for the evening are $25 each or $45 per couple.

Numerous event prizes will be given out, including a voucher for a free kayak rental (valued at $50), two free passes for the upcoming season aboard the Hiawatha in Williamsport, a Songs of the Susquehanna Volume 2 CD from the Middle Susquehanna Riverkeeper Association, and much more from businesses ranging from Williamsport to Lewisburg and Milton.

Earth Day’s origins go back to the environmental movement of the 1970s, helping spark the nation’s Clean Water Act 50 years ago this year, along with a number of other environmental milestones.

It is estimated that 10 percent of American citizens were engaged at some point during the first Earth Day in 1970. The event went global in 1990, organized by Hayes, giving a big boost to the recycling movement. Approximately 200 million people across the planet took part that year.