Each week, Hoopla and the Iowa Cultural Corridor Alliance team up to showcase arts and culture events in Eastern Iowa. Below are the hidden gems:   In honor of the 30th anniversary of the Iowa Arts Festival, the public is invited to the Thirty30 Celebration on Thursday, April 11th, from 5:30 – 8 p.m. at the Sheraton Iowa City Hotel in downtown Iowa City. Tickets are $30 each ($35 at the door) and include hors d’oeuvres, live music by Rod Pierson’s ‘Not So Big’ Band featuring Craig Boche, as well as a live and silent auction. A cash bar will also be available. This is a great opportunity to give back to one of the longest-running festivals in the area. Live and silent auctions will include Celebrity Paintings by Lisa Bluder, Jil Dasher & Jamie Boling, Terry Dickens, Kirk & Mary Ferentz, Dan Gable, Mark Ginsberg, Matt Hayek, Nate Kaeding, Fran & Margaret McCaffery, Christopher Merrill, Bill Nusser and Catherine Champion, Christine Scheetz and Steve West. The auction also includes items donated by 2012 Art Fair participants, plus items from local businesses like Riverside Casino, M.C. Ginsberg Jewelers, Formosa, Takanami and many others! All proceeds from the silent and live auction support the Iowa Arts Festival. Tickets may be purchased by calling the Summer of the Arts office at 319.337.7944.     Working Group Theatre, in partnership with Hancher, presents The Broken Chord this weekend at The Englert Theatre. How do we remember? Why do we forget? What happens when we can no longer pull from the well of memory that lies within us? The Broken Chord, a full-length play weaving direct testimony and interviews with storytelling and poetry, will be the culmination of a year-long collaboration between Working Group Theatre and Hancher. Designed to collect, archive, and present the personal stories of those working on the front lines of memory and aging research and patient care, as well as those who are suffering from memory-related diseases, the show features an interactive set design and uses professional actors and community members to tell the story of how we understand memory and cope with its loss. Shows are Friday, April 12, and Saturday, April 13, at 7:30 p.m. and Sunday, April 14 at 2:00 p.m. Tickets are $10-$35, available at the Hancher Box office: 1.800.HANCHER.   Wickiup Hill Learning Center in Toddville is having a grand opening celebration of the new exhibit space Oliver and Ava's River Raft Adventure on Saturday, April 13th, 2013, 10-4PM. The expanded exhibit project promotes youth education of critical natural resources, renewable energy and sustainable communities, provides a hub for family activities and life-long learning opportunities and education about the Cedar River and wise management of this natural resources related to water quality and floodplain management, and improves the quality of life for the Linn County Community by providing a destination and educational resource. This is your opportunity to join Oliver & Ava on their outdoor adventure! Oliver and Ava have a class assignment to explore a local park and bring in photos of what they find. Boy, do they find a lot! Don’t forget to bring your camera and see if you can discover everything they do! Follow the dragonfly through Life Along the River, Nature is Fun, and Everyone Lives in a Watershed exhibits! Admission is free and kids take home a free Oliver and Ava coloring book.   The Early Keyboard Society presents Marcia Hadjimarkos, Concert for Clavichord, on Sunday, April 14, at 3:00 p.m. at the Trinity Episcopal Church, 320 E. College St in Iowa City. Marcia Hadjimarkos, whose performances are described as “imaginatively realised, full-blooded, and loving”, “gentle, almost introverted yet brilliantly intelligent”, and “dynamic, free, and powerfully shaped”, fell in love with keyboard instruments at the age of four when she received her first record, a 45 of “The Dance of the Sugar Plum Fairy “ and heard the magical sound of the celesta. During the last 20-odd years, spent mostly in rural Burgundy, Marcia has become an internationally recognized specialist on the fortepiano and clavichord, performing frequently in solo recitals as well as chamber music and lieder concerts. Her 8-recital performance of the complete Haydn sonatas on a variety of early keyboards met with critical success, as have her recordings. have earned a Diapason d’Or, 5 star reviews in Goldberg, Musica, and Fonoforum, and enthusiastic articles in Fanfare, Télérama, Gramophone and Le Monde de la Musique. The concert is free and open to the public.   Orchestra Iowa & Ballet Quad Cities present Cinderella, Saturday, April 13, at 7:30 p.m. and Sunday, April 14, at 2:30 p.m. at the Paramount Theatre. The 2012-2013 symphonic season marks the beginning of an exciting cultural partnership between Orchestra Iowa and Ballet Quad Cities. These two premier state arts organizations continue their partnership, presenting Prokofiev’s classic ballet, Cinderella. In this family-friendly production, audiences from young to old are captivated by the magic as Cinderella transforms for the grand ball, and wins the heart of her Prince all before midnight. Join Maestro Hankewich, the Orchestra and the professional dancers of Ballet Quad Cities as they bring this fairy-tale favorite to life. Single tickets for Cinderella are $20-$50 and may be purchased online at orchestraiowa.org or by calling 319.366.8203.