Mango Languages informational workshop offered by Pitkin County Library. Mango Languages is an online language-learning database. One can learn to speak Spanish, French, German, Mandarin Chinese, Russian and more. Spanish, Polish and Brazilian Portuguese speakers can also use it to learn English. Bring a laptop if you can. 5:30-6:30 p.m. at the library in Aspen. 429-1920.

"Aspen’s Past to Present” by Aspen Walking Tours. Tracing the evolution of Aspen from its humble beginnings to world famous resort. 90 min. 1:30 p.m. (970) 948-4349.

Nia classes offered by Julie Hart. Nia is a dance of body, mind, spirit and emotions blending elements of yoga, tai chi, martial arts and modern and ethnic dance. Tuesday and Thursday, 9-10 a.m. at Dance Progressions, 403 Aspen Airport Business Center. Cost: $20 drop-in. 303-333-3311.