8 p.m., Juanita's. $20.
'Tis the season for old school local rockers to dust off their instruments for a good cause. Now in its ninth year, Hornucopia returns on Christmas Eve Eve to raise money for Play It Again, Arkansas, a non-profit established to provide instruments to students whose families can't afford them. The organization collects donations of unused instruments, refurbishes them and passes them along to band directors throughout the state (you can get more information by emailing John Caldwell at firstname.lastname@example.org). The lineup features the St. James Group, a country rock act popular in the late '60s and early '70s; Katmandu, featuring vets of Plum Loco; the long-tenured rock and soul act the GroanUps; and Grumpy Old Men, a group of 25 that'll rotate on and off the stage. Members of other acts on the bill as well as former members of bands like Leavenworth, Merging Traffic and Rock Creek make up the group. In keeping with the theme, there'll be a horn section, too.