411 REFERENCE · Wiktionary
Sol de Mayos
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
en es Sol de Mayo.
In English, the plural for the phrase is Sol de Mayos, while in Spanish, it correctly changes to Soles de Mayo.
In English, a plural is often formed by adding an "s" to the end of the full phrase; in Spanish, a plural is formed by making the noun sol plural (soles), leaving the prepositional phrase de mayo unchanged.
Noun
en noun form
en Sol de Mayo.