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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER EXPENSES INCLUDE A PROPOSED ASSESSMENT FROM THE STATE OF NJ WITH THE DEPARTMENT OF LABOR IN THE AMOUNT OF 173,001 WHICH IS CURRENTLY UNDER APPEAL. IT IS REASONABLE EXPECTED THAT THE AMOUNT WILL BE SIGNIFICANTLY REDUCED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>IN THE PAST YEAR WITH THE CONTINUATION OF COVID, MAINSTAGE'S PROGRAMMING HAS BEEN DEEPLY IMPACTED. MAINSTAGE HAS TAKEN THIS AS A CHALLENGE AND HAS STILL BEEN ABLE TO OFFER IMPORTANT PROGRAMMING, ALBEIT CURTAILED. SUBSEQUENTLY, OUR INCOME FROM SHOWS AND PROGRAMMING HAS BEEN NEGATIVELY IMPACTED. OUR KEYSTONE PROGRAM, SUMMER STAGE 2021 INVOLVED 200 YOUNG PEOPLE PRODUCING FOR SHOWS FOR VIRTUAL AUDIENCES INSTEAD OF THE USUAL 375 YOUNG PEOPLE PRODUCING 20 LIVE PERFORMANCES FOR THOUSANDS IN OUR AUDIENCES. OUR STUDIO ARTS EDUCATION PROGRAM WITH CLASSES IN ACTING, DANCE, VOICE, AND MUSICAL INSTRUMENTS OPERATED AT 60% REGISTRATIONS DUE TO THE PANDEMIC. OUR SHOW CHOIR HARMONY WAS SUSPENDED FOR A NUMBER OF MONTHS AND PERFORMED IN 6 SHOWS INSTEAD OF A NUMBER USUALLY APPROACHING 30. IN THE SUMMER, MAINSTAGE WAS ABLE TO PRESENT ITS CONCERT IN THE PARK SERIES AT GLOUCESTER TOWNSHIP'S VETERANS PARK WITH 6 LOCAL AND REGIONAL BANDS. UNFORTUNATELY, OUR LARGE COMMUNITY EVENT, THE BLACKWOOD PUMPKIN FESTIVAL FOR OVER 180 VENDORS AND 8,000 IN ATTENDANCE WAS CANCELED IN OCTOBER BECAUSE OF LACK OF VOLUNTEERS AND CONCERNS OVER THE SPREAD OF THE VIRUS. WITH FEDERAL, STATE, AND REGIONAL GOVERNMENT ASSISTANCE, MAINSTAGE WAS ABLE TO OPERATE AND PAY ITS BILLS. MAINSTAGE REMAINS HOPEFUL THAT THE NEW YEAR WILL BRING A RETURN TO NORMAL PROGRAMMING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4D</FormAndLineReferenceDesc>
        <ExplanationTxt>PROMOTION OF THE STUDY, IMPROVEMENT, AND ADVANCEMENT OF THE ARTS, SUCH AS THEATER, DANCE AND MUSCIAL ACTIVITIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>MAINSTAGE CENTER FOR THE ARTS MAINSTAGE CENTER FOR THE ARTS BUSINESS MGR DIRECTOR MARRIED</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 990 IS REVIEWED BY THE EXECUTIVE DIRECTOR AND THE TREASURER.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ENFORCEMENT OF THE CONFLICT OF INTEREST POLICY IS CONSIDRED AT BOARD MEETINGS AND BY THE DIRECTORS BEFORE THE APPROVAL OF HIRIING, CONTRACTS AND PAYMENT. CONCLICTS OF INTEREST ARE REVIEWED PERIODCIALLY AND THE BOARD OF DIRECTORS AND KEY EMPLOYEES MUST SIGN OFF THAT THEY ARE IN COMPLIANCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>BOARD APPROVAL</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>DIRECTORS AND BOARD APPROVAL</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>UPON REQUEST</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>ROUNDING ADJUSTMENT 0</ExplanationTxt>
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</Return>
