A wedding involving two different religions has a lot of challenges.
In order to plan a successful one where both religions/faiths/beliefs are incorporated the right way, do the following:
You just have to incorporate both of them- For instance, you are a catholic marrying a Muslim, you have to find a way to incorporate both faiths so no one feels neglected.
Neutral Location- With an interfaith wedding, you just have to use a neutral location for your ceremony. This way, no one feels slighted.
Compromise- Both of you have to decide which traditions or components of your religions mean something to you personally and you both want to include in your wedding in some way.
Have detailed programs- In order to make everyone feel included in the ceremony, have a detailed program.