In the Trelfa Photographic Collection, 1886-1920, Series 6, which contains Sepull Glass-plate negatives, there are early Alpena images showing how Halloween was celebrated in Alpena in 1904. These images can be found in Box 2, Folders 45 and 46. Click the link to view the catalog record and finding aids for this collection (the fifth finding aid link includes the listing noting the Halloween images).