1. Mostly sunny: Today will be mostly sunny with a high near 41 degrees and an evening low around 18, according to the National Weather Service.

2. Pan-Mass signups: Registration opens today for new riders interested in participating in the Pan-Mass Challenge. Now in its 34th year, the annual cross-commonwealth bike-a-thon raises money for cancer research and treatment programs at the Dana-Farber Cancer Institute. There are routes for all ages and skill levels, ranging from 27 miles to 111 miles. Last year, 48 Charlestown residents raised more than $278,000 for the cause. For more information or to register, visit www.pmc.org.

3. Theatre program: The Boston Theatre Project is accepting registrations for two upcoming classes—a musical theatre dance class and scene/song study class for children ages 8-12. Both classes will be held at the StoveFactory in Charlestown. Scholarships are available. For more information, visit www.bostontheatreproject.com or email info@bostontheatreproject.com.

4. Comedy show: Tickets are now available for Charlestown Youth Hockey’s annual Comedy Night fundraiser, scheduled Sunday, Feb. 17 at the Knights of Columbus hall. Tony V. will headline, along with a “star-studded lineup of comedians.” Tickets cost $25 each or $200 for a table of 10. To purchase, contact a Youth Hockey board member (contact info at cyha.com).

5. Library search: If you’ve ever wondered how to use the Boston Public Library’s vast resources for research, there’s a class today at the Central Library in Copley Square (700 Boylston St.) that can help. Learn how to use the library’s newspaper databases and microfilm collections during a free session offered at 2:30 p.m. in the library’s Training Lab.

Got a Charlestown event coming up? Make sure it's on our calendar and send the link to becca.manning@patch.com to be featured in one of our morning "5 Things You Should Know."