If you have one, yes! We'll be using Kol HaNeshamah: Machzor LeYamim Noraim, the Reconstrucionist movement's machzor and will have copies to share, but you're welcome to follow along with whatever High Holiday prayerbook you feel called to use. We encourage everyone with the means to do so purchase a Mahzor or two from the Jewish Reconstructionist Press online for their own continued use or as a donation to the congregation.