How is Uposatha practiced in non Buddhist countries?

Uposatha (a.k.a. Poya Day) is the traditional Buddhist observance day. Observances vary but one traditional pattern is to celebrate this day on the lunar calendar on each of four moon events; the new moon, full moon, and quarter moons. For those living in traditional Buddhist countries or communities, there may be opportunities to visit a monastery. But how do those in non Buddhist countries celebrate the holiday?