1: António Guterres takes office as the new U.N. Secretary-General for a five-year term.
1: Malta assumes the presidency of the Council of the European Union for a six-month term.
17--20: The World Economic Forum gathers leaders at its annual meeting in Davos, Switzerland.
20: Donald Trump is inaugurated as the 45th President of the United States.
21: The Women's March on Washington advocates for women's rights under Trump's presidency.
28: Lunar New Year rings in the Year of the Rooster.
1: Fifth annual World Hijab Day
13: First anniversary of U.S. Supreme Court Justice Antonin Scalia's death.
23--26: The Democratic National Committee holds its winter meeting and will vote on a new chair.
27: The U.N. Human Rights Council session begins.
1: Same-sex marriage becomes legal in Finland.
31: British Prime Minister Theresa May's self-imposed deadline for triggering Article 50 of the E.U. treaty, which will begin the U.K.'s exit from the union.
31: India's deadline for exchanging 500- and 1,000-rupee notes, which were discontinued as part of Prime Minister Narendra Modi's crackdown on crime and corruption.
3: Starbucks founder Howard Schultz steps down as CEO; Kevin Johnson, the company's president and COO, will take over.
29: President Donald Trump's 100th day in office.
TBD: The NBA opens its first elite basketball training center in India after launching three similar centers in China.
1: Coca-Cola CEO Muhtar Kent steps down; president and COO James Quincey will succeed him.
3--5: The World Economic Forum on Africa takes place in South Africa.
26--27: Italy hosts the G-7 summit with the leaders of Canada, France, Germany, Italy, Japan, the U.K. and the U.S., as well as representatives from the E.U.
31: Pope Francis (above) invites Catholics to participate in celebrations in Italy marking the 50th anniversary of the Charismatic Renewal.
5: Bill Cosby is expected to face trial on sexual-assault charges.
10: Expo 2017, a global conference on the future of energy, begins in Kazakhstan.
12: The annual Fortune 500 list hits newsstands.
30: The last day of Ryan Lochte's 10-month ban from U.S. swimming following his misbehavior at the Rio Olympics.
1: Mexico's central bank head Agustín Carstens steps down.
7--8: Germany hosts the G-20 summit.
15: France's state of emergency established after the 2015 terrorist attacks expires.
1: NSA leaker Edward Snowden's temporary asylum permit in Russia is set to expire.
9--10: Australia-China BusinessWeek, organized by the Australian Business Forum, is held in Melbourne.
23--24: The Healthcare Innovation Summit, run by the African Innovator Group, convenes in Johannesburg.
12: The U.N. General Assembly convenes in New York City for its 72nd regular session.
27--29: The 40th World Energy Engineering Congress, presented by the Association of Energy Engineers, will be held in Atlanta.
TBD: Spain's Catalonia region is expected to hold an independence referendum.
2: The U.S. Supreme Court begins its annual term.
10: Liberia elects its next president; incumbent Ellen Johnson Sirleaf is not running for re-election.
13--15: The World Bank and International Monetary Fund hold annual meetings in Washington.
6--17: The U.N. Convention on Climate Change will hold the 23rd session of the Conference of the Parties in Germany.
10: Gambia withdraws from the International Criminal Court.
26: Honduras holds a presidential election; incumbent Juan Orlando Hernández (above) is running for re-election after the Supreme Court overturned a one-term limit.
TBD: North Carolina holds a special legislative election after a federal court found racial gerrymandering and required the state to redraw its district lines.
10: The Nobel Prizes are bestowed on the winners.
31: The deadline for California to begin issuing sales licenses for recreational-marijuana retailers following a 2016 referendum.
TBD: TIME names its Person of the Year.
Compiled by Tessa Berenson and Julie Shapiro