Here are the steps you’ll need:
- Use the Places tool (More–>Places on the main iNaturalist page) to make a polygon that is your target area. For a little block you will want to make the boundaries well outside the real boundaries (can explain why but trust me). Save the Place as a kml file.
- Go to your project and choose “Edit Project.” If it is already a Collection project, scroll down to where you can specify a range of dates, and make them match the BioBlitz. If it was not created as a Collection project, I would advise converting it (or just starting over with a Collection project). Also look for the “include places” blank and put in the name of the place you just made.
If you make it a date-specific Collection project, people won’t have to enter their observations. They will go in automatically.
Hope that helps!