In short
The Lord's Supper
The Lord's Supper shares in the bread and the cup as a sign of faith in Jesus our Saviour. It includes the service of foot washing, which shows humility, renewed commitment and unity in love. All believers may take part.
Read it in the Bible
1 Corinthians 10:16, 17; 11:23-30; Matthew 26:17-30; John 13:1-17
This is a short summary. The church's full statements are at adventist.org, and our pastors are glad to study any belief with you.