OLYMPIA — Sponsors of a campaign to overturn the state’s recent “everything but marriage” domestic partnership law have set an appointment to turn in their petition signatures this weekend.

Secretary of State Sam Reed says supporters of Referendum 71 have made an appointment to turn in the signatures at 2 p.m. Saturday.

To qualify for the November ballot, they must have 120,577 valid voter signatures, and election officials have suggested that referendum sponsors turn in about 150,000 as a buffer.

The new expanded domestic partnership law is scheduled to take effect Sunday, but will be delayed if the referendum seekers turn in their petitions Saturday afternoon. If they have enough signatures, the law will be delayed until the outcome of the election.