October 23

First Baptist Church of Pearl City, 1445 Hoolaulea St., Tuesdays through Dec. 11, 9-10:30 a.m., free. This class is a low-impact beginner’s class for seniors. The focus is to provide evidence-based techniques to improve flexibility and balance. (681-1463)

Adventist Health Castle, 5-6:30 p.m., $10-$15. Children who are soon to be older siblings can learn about their new responsibilities, as well as share their thoughts with their parents. Parents will learn how to welcome a new baby and foster a positive relationship between new siblings. Pre-registration required. (263-5400, adventisthealthcastle.org)

University of Hawaii at Manoa, Campus Center, Ballroom CC301, 8 a.m.-3 p.m., free. Donate blood and save lives. Pre-registration recommended. (848-4770, bbh.org)

Kapalama Elementary School, 1601 North School St., 7-8:30 p.m., free. The community is invited to engage in a conversation on water-related issues and solutions for watershed health, cultural resources, water quality, climate change resilience, sea level rise adaptation, and diversified water supply and water conservation options for meeting future water needs to 2100. (boardofwatersupply.com)

Kalihi Valley District Park, 1911 Kamehameha IV Road, 5:30-7:30 p.m., free. Come for a spooky fun house and candy giveaway. (768-8964)

Blue Note Hawaii, 6:30 and 9 p.m., $25-$45. Trumpeter Mike Lewis presents a night of growing talent, showcasing the best of local high school jazz band from around the state. (bluenotehawaii.com)