Numerous downtown Los Altos merchants will be staying open late today and offer visitors treats as they invite visitors to take a "Holiday Stroll." The special event, scheduled 5-9 p.m., is sponsored by the Los Altos Village Association. Meanwhile, "Holiday Magic" is happening today and tomorrow at the Los Altos Discovery Shop, 243 Main St., with proceeds benefiting the American Cancer Society. Organizers said they are offering "only the best" merchandise on sale. The Discovery Shop is open until 9 p.m. today and 10 a.m. to 5 p.m. Saturday. For more information, call (650) 949-0505.