By MARGARET STAFFORD and GARY FIELDS, Associated Press LIBERTY, Missouri (AP) — Sikhs across the United States are holding toned-down Vaisakhi celebrations this week, joining people of other faiths in observing major holidays cautiously this spring as COVID-19 keeps an uneven hold on the country. Vaisakhi, which falls April 13 or 14 depending on which of two dueling calendars one follows, marks the