As an expert in cultural and historical events, I can provide you with a list of holidays that were observed in May 2017. Please note that the observance of holidays can vary by country and sometimes by region within a country. Here are some of the significant holidays that were celebrated in May 2017:
1. May Day - May 1st, celebrated in many countries as a day for workers' rights and the labor movement.
2. Cinco de Mayo - May 5th, primarily recognized in Mexico and the United States, commemorating the Battle of Puebla.
3. Mother's Day - The second Sunday in May, which was May 14th in 2017, a day to honor mothers and motherhood in many countries.
4. Memorial Day - Last Monday in May, which was May 29th in 2017 in the United States, a federal holiday to remember military personnel who have died in the performance of their duties.
5. Europe Day - May 9th, celebrates peace and unity in Europe, although it is not widely observed as a public holiday.
6. Vesak - This is a Buddhist holiday that marks the birth, enlightenment, and death of Gautama Buddha. The date varies, but in 2017 it fell on May 10th.
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