I may be moving soon and I was looking for Orthodox churches in the area. My two main choices are an OCA church and a GOA church. Visiting each of their websites, I noticed that the OCA church celebrates Vespers on Saturday and Divine Liturgy on Sunday with no Orthros. The GOA church celebrates only Orthros before Divine Liturgy with no Vespers the day before.
Do the Russian churches typically not celebrate Orthros and do GOA churches typically not celebrate Vespers? I'd be disappointed either way. I'm very fortunate that my current church offers the full range of services for Sundays (It's an Antiochian parish) and there are no churches nearby which do the same.
It's my experience that OCA parishes (here, anyway) have Great Vespers on Saturday evenings and Matins before Liturgy on Sundays. I have, however, been to a number of parishes that did
celebrate Matins but did not
list it on their sites or signs, and keep in mind that your OCA parish may celebrate Vigil (Great Vespers followed by Matins) on Saturdays, and not just Great Vespers (although I believe this is more common in the ROCOR than the OCA).
IOW, don't take the list as authoritative. Ask somebody.