วิกิพีเดีย:วันนี้ในอดีต/เมษายน

I don't have any context provided to base an overview on. You've referenced "Wikipedia:Selected anniversaries/April" but haven't included the actual content or description from that Wikipedia page. Could you please share the context or information about this page so I can write an accurate overview?

AI-generated from the Wikipedia summary — may contain errors.