Green milkshakes served to celebrate St. Patrick's Day, especially at McDonald's.

Shamrock Shakes

Also could be a reference to the large Irish influence and population in Boston. For example:

  • People of Irish descent form the largest single ethnic group in the city, making up 15.8% of the population. [1]
  • Irish Americans are a major influence on Boston's politics and religious institutions. [2]
  • Irish immigrants dominated the first wave of newcomers [to Boston] during [the 1820's] period. By 1850, about 35,000 Irish lived in Boston.[3]

from For Boston

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