Out of respect for other Christian communities, permission can be obtained for a wedding between a Catholic and a non-Catholic Christian to be celebrated at a non-Catholic church. The Catholic spouse must obtain a “dispensation from canonical form” (i.e., a release from the formal requirements that the wedding occur in a Catholic Church, witnessed by a Catholic priest, deacon or bishop) from his/her bishop.
Your priest or deacon will help you to obtain this dispensation from the Chancery Office. Obtaining the dispensation can take time, so you should start the process early.