The towns of Acton and Boxborough are joining forces to host a community wellness fair from 8:30 a.m. to 1:30 p.m. Saturday at Acton-Boxborough Regional High School. The sixth annual session of Wellness and You (formerly known as Wellness University), open to all residents 18 years and older, promotes healthy lifestyles through classes and activities on a variety of physical and mental health topics. The fair will include talks on maintaining healthy bones, speeding up metabolism, and preventing mosquito- and tick-borne diseases, as well as sessions on jazzercise and zumba. Participants must preregister. For more information, contact the Acton Health Department at 978-929-6632 or firstname.lastname@example.org.