No. The miraculous happens everywhere and within all denominations. Most of my guests on the Touched by Heaven podcast have been non-Catholics who have shared their experience of encounter . Every talk is custom tailored for that particular audience.
At a Catholic venue I might talk about Eucharistic miracles, Fatima, Marian apparitions, miracles of the Holy Rosary, the science within the image of Our Lady of Guadalupe, and the miracles surrounding the saints.
At other venues, I might include angels, miraculous healings, the consistent theme of near-death experiences, God-incidents, divine intervention, etc.
God is limitless in his every day collisions of heaven and earth. What is important, is embracing His voice. He speaks to us in the miraculous.