A fully executed contract date begins once both parties signed it. In your case, since you signed them first, the date begins when the seller/affixes his signature. However, the delivery of the ratified contract should also be considered. Consult your realtor and a lawyer.
A group of spiders is called a cluster or clutter. Spiders belong to the group of animals called arachnids.
The charming orb spiders that spin their cartwheel webs in the garden, belong in the family Argiopidae. Among them is a group of pretty colored spiders of the genus Argiope. Each member of the genus has her personal species name. The one we know best is the busy orange and black orb spider.