SSPX chapels are adding Masses to this Sundays schedule to comply with the 50 person limit. So, they are going forward. I know this for sure in at least 3 places because I have family that attend said places. The missions are indeed suspended. Most of them have rented facilities and thus it's out of the SSPX's control. Good on them. All of the Eastern Orthodox liturgies have been cancelled except for the ROCOR (Russian), which is interesting.