Prep the strawberry mixture several hours in advance to the day before to give them time to absorb the sugar and do their thing. I would make the gluten free shortcakes the day you plan to serve them. They do dry out quickly. They still taste good, but they do become more dry and crumbly the next day. If you have leftovers, wrap them in a damp paper towel and microwave them for about 20 seconds before serving for the best results.