You can inspire donors in a group setting.
You can educate donors in a group setting.
You can engage donors in a group setting.
You can relationship-build with donors in a group setting.
You can share your strategic plans and funding priorities with donors in a group setting.
You can receive feedback from donors in a group setting.
You can steward donors in a group setting.
You can show the impact of giving to donors in a group setting.
But, you should only invite donors to give in an individual setting.