What is the difference between the launch date and the grab date of a new TLD?

Some new TLDs have both a launch date and a grab date. The reason for this is usually because the new TLD has a "Early Access General Availability" period. This period is before the official launch of the domain. In this case, we will attempt to register a preordered domain name on the grab date, which is the official launch date for that domain. This is also because the price to register domains during the Early Access period is much higher. An example of this is Donuts' Early Access General Availability period, which runs for 7 days before launch.