Oi amigo, no nscalendar eu utilizei o plugin https://www.nuget.org/packages/Xamarin.Forms.PageControl/?fbclid=IwAR23hsgvF9o_KrX7suyQXpY3GjFruU4HuIM4b3Uh8vRs0u9-E2-e-1VgEMM mas tambem existe o controle https://medium.com/@bertuzzi/o-x-do-xamarin-forms-uma-op%C3%A7%C3%A3o-ao-carousel-view-1be0e21d461e?fbclid=IwAR173b8vnov1R7a17p0JTOsWtjJ9_uXt5OsTvEX1w-u0gdeFwGCFHhmZytQ que facilita a paginação. Grande abraço