Yip Wing-sie (left) presents and conducts the HK Sinfonietta in a concert with an all-Mendelssohn programme. Violinist Le Hoai-nam features and Lynn Yau is a special guest. Today-tomorrow, 7.30pm, HK City Hall, 5 Edinburgh Place, Central, HK$100-HK$220 Urbtix. Inquiries: 2836 3336