It is called a few names.
Sabbath service, service, weekend service etc.
Chapel or Church are more colloquial names.
Another name for Seventh-day Adventist is Adventist.
Seventh Day Adventist.
Seventh-day Adventist Hymnal was created in 1985.
Magic Johnson is no longer a Seventh Day Adventist
Seventh-day Adventist Hymnal has 832 pages.
Rotorua Seventh-day Adventist School was created in 1953.
Association of Seventh-day Adventist Librarians was created in 1981.
Seventh Day Adventist Hospital Ottapalam was created in 1969.
Seventh-day Adventist Kinship International was created in 1981.
Creation Seventh Day Adventist Church was created in 1988.
Seventh Day Adventist Reform Movement was created in 1925.
Seventh-day Adventist Church in Canada was created in 1863.