Yes! I was surprised how well summer squash held up to freezing. Assemble the squash as described but just don’t cook it. Store it in a plastic bag or airtight container and carefully place it in the freezer making sure the squash is  level until completely frozen. Serving tins work great for this since they come with tops and the squash can be thawed and cooked right in the tin. When you’re ready to serve, the easiest thing to do is pull the squash out of the freezer the day before so it can thaw in the refrigerator. But if you decide to pull it out of the freezer at the last minute, put the container into a slightly warm water bath. You don’t want the squash directly in the water, just the container storing the squash.