July 15

Happiness U, 675 Auahi St., Suite E3-205, 2-3 p.m., $25. This interactive presentation focuses on how individuals can harness their personal and professional strengths, and update any weaknesses in order to successfully navigate challenging communications in the workplace. (yourhappinessu.com)

Pearl City Public Library, 11 a.m., free. A counselor from Hawaii State Health Insurance Assistance Program will share information on Medicare, how to enroll and answer questions. (librarieshawaii.org/event/the-medicare-maze)

Hawaii Kai Retirement Community, 428 Kawaihae St., 11 a.m.-3 p.m., free. Purchase specialty food and drinks, handmade gifts, boutique clothing, jewelry and more. (artsandflavorshi.com, 232-9208)

Kailua Town Center, Bloodmobile, 7-11 a.m., free. Donate blood and save lives. Pre-registration recommended. (848-4770, bbh.org)

Waikele Center, Bloodmobile, 7-11 a.m., free. Donate blood and save lives. Pre-registration recommended. (848-4770, bbh.org)

Blaisdell Exhibition Hall, 777 Ward Ave., 10:30 a.m.-5:30 p.m., $2-$20. This show features 170 booths with the largest selection of vintage and antique Hawaiiana under one roof. Vendors from Oahu, neighbor islands, Mainland and Japan will offer a variety of different items. Those who purchase early admission can enter at 9:30 a.m. (ukulele.com/collect.html)

Japanese Cultural Center, Manoa Grand Ballroom, 6:30 p.m., $50-$60. Three contestants will be honored with the titles of Queen of Queens, Golden Goddess and Closet Queen. The theme of this year’s pageant is “The Greatest Show On Earth,” and guests are encouraged to dress up. (hawaiiboaartsball.com)

Pearlridge Center, Uptown, center hours through Aug. 15, $4-$19. Enjoy activities such as a Virtual Reality Roller Coaster, Eyeplay Interactive Gaming, Rope Maze and Eurobungy. (203-2366, pearlridgeonline.com)

Basalt, Sundays through July, 6 p.m., free. Enjoy a performance of R&B and contemporary music. (dukeslanehawaii.com)

McKinley High School, auditorium, 5:30-7:30 p.m., free. (hiyouthsymphony.org, pacificmusicinstitute.org)

Kapiolani Park, 10:30 a.m.-5 p.m., free. Ukulele master teacher Roy Sakuma directs an event featuring fifteen musicians and acts, both local and from abroad, performing in celebration of the ukulele. There will also be fun family activities, food booths, giveaways and more. (ukulelefestivalhawaii.org)

University of Hawaii at Manoa, Art Auditorium, 3 p.m., free. See free screenings of animations and live-action features and shorts. There will also be door prizes and special events. (summer.hawaii.edu)