From CNA:
Amid heavy immigration enforcement by the Trump administration, several bishops in the U.S. have recently issued broad dispensations to Catholics in their dioceses, allowing them to refrain from attending Mass on Sundays if they fear arrest or deportation from federal officials. Bishops in North Carolina, California, and elsewhere have issued such dispensations, stating that those with legitimate concerns of being detained by immigration agents are free from the usual Sunday obligation. [scroll for more:]
The Church’s canon law dictates that Sunday is considered the “primordial holy day of obligation,” one on which all Catholics are “obliged to participate in the Mass.” Several other holy days of obligation exist throughout the liturgical year, though Sunday (or the Saturday evening prior) is always considered obligatory for Mass attendance.