A fact from Alfred Russel Wallace centenary appeared on Wikipedia's Main Page in the Did you know column on 7 November 2013 (check views). The text of the entry was as follows:
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Currently the article is only linked from the Wallace page. Is there a way that we could either create a navbox or something else that would create a relevant network of science anniversaries or celebrations (such as Ada Lovelace Day)? Sadads (talk) 17:24, 7 November 2013 (UTC)[reply]
Firstly, as you say, the article is linked so it is not an orphan. It would be possible to have a list or perhaps a navbox of such things, but we'd have to take care it did not become indiscriminate, say by insisting on documented, official celebrations, with citations. Chiswick Chap (talk) 08:23, 8 November 2013 (UTC)[reply]
Orphaned is less than 3 articles linking in (per the longstanding definition). I added an early version of the template with the holidays that I could find. Surprised at how scatter they are on Wikipedia. Would appreciate help continuing to populate the template and category, Sadads (talk) 15:07, 8 November 2013 (UTC)[reply]