Please summarize this paragraph in one sentence. 

May Day is a public holiday usually celebrated on 1 May. It is an ancient Northern Hemisphere spring festival and a traditional spring holiday in many cultures. Dances, singing, and cake are usually part of the festivities. In the late 19th century, May Day was chosen as the date for International Workers' Day by the Socialists and Communists of the Second International to commemorate the Haymarket affair in Chicago. International Workers' Day can also be referred to as "May Day", but it is a different celebration from the traditional May Day.
system
kripaya is paragraph ko ek vaakya main sankshep main prastut karen.

may de ek saarvajanik avkaash he jo aamtaur par 1 may ko manaaya jaataa he.yah ek pracheen uttari golardh vasant mahotsav or kai samskritiyon main ek paaramparik vasant chuttee he.nrity, gayan or kek aamtaur par utsav kaa hissaa hote hai.19 veen shatabdi ke uttarardh main, may diwas ko chicago main hemmarket afaire ke samaran ke liye duusare antarrashtriya ke samaajwaadiyon or communiston dwaara antarrashtriya shramikon ke din kii taarikh ke rup main chunaa gaya tha.antarrashtriya shramikon ke diwas ko "may diwas" ke rup main bhi sanderbhit kiya ja saktaa he, lekin yah paaramparik may diwas se ek alag utsav he.
user
kai samskritiyon, samaajwaadiyon or duusare antarrashtriya ke communiston main ek paaramparik vasant mahotsav ne may diwas ko hemarket ke chakkar ko manaane or antarrashtriya kaaryakarta diwas banane ke liye chunaa.
assistant
<|system|>
</s>
<|user|>
kripaya is paragraph ko ek vaakya main sankshep main prastut karen.

may de ek saarvajanik avkaash he jo aamtaur par 1 may ko manaaya jaataa he.yah ek pracheen uttari golardh vasant mahotsav or kai samskritiyon main ek paaramparik vasant chuttee he.nrity, gayan or kek aamtaur par utsav kaa hissaa hote hai.19 veen shatabdi ke uttarardh main, may diwas ko chicago main hemmarket afaire ke samaran ke liye duusare antarrashtriya ke samaajwaadiyon or communiston dwaara antarrashtriya shramikon ke din kii taarikh ke rup main chunaa gaya tha.antarrashtriya shramikon ke diwas ko "may diwas" ke rup main bhi sanderbhit kiya ja saktaa he, lekin yah paaramparik may diwas se ek alag utsav he.</s>
<|assistant|>
kai samskritiyon, samaajwaadiyon or duusare antarrashtriya ke communiston main ek paaramparik vasant mahotsav ne may diwas ko hemarket ke chakkar ko manaane or antarrashtriya kaaryakarta diwas banane ke liye chunaa.</s>
