Q: In this task, a passage will be given and the goal is to generate a question about temporal relations based on that passage. A temporal relation describes the relation between two things with respect to time e.g., something happens/starts/terminates/... immediately/shortly/usually/... before/after/during/... something else.
Your question should include an event, or ask about an event, and should not be a yes/no question.
Passage: Dataproducts Inc. said it filed a lawsuit in Delaware Chancery Court to block a tender offer by DPC Acquisition Partners, alleging that the hostile offer violates a standstill agreement between the two concerns. DPC, an investor group led by New York-based Crescott Investment Associates, had itself filed a suit in state court in Los Angeles seeking to nullify the agreement.
A:
What event has already happened?