The church was rebuilt after the former building was destroyed in an arson in October 2010.
A ribbon-cutting and dedication ceremony are planned for 10 a.m., church officials said.
The ceremony is planned "in part to thank the Mukilteo community for their support," said Kirsten Mullins, a regional church spokeswoman. There also will be music, refreshments and displays.
Mayor Joe Marine is expected to speak, along with church leaders.
The open house is expected to continue until 5 p.m. The church is located at 11001 Harbour Pointe Blvd.
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