Given the task definition and input, reply with output. Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'In most of the world , except in the US , Labor Day is celebrated on the 1st of May in remembrance of the 1886 Haymarket Riot .', Argument/Subject 1: 'labor day', Argument/Subject 2: 'may'
be celebrate in