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.
Read the full list of group terms here, or look at our favourites below. A group of cats is called a glaring. A group of chickens is also known as a peep. A group of crocodiles can also be referred to as a bask. A group of leopards is known as a leap. Many monkeys are a troop. Muster is the correct collective noun for a group of peacocks. A group of toads is referred to as a knot.