What special traditions do you do at a catholic/evangelical Christan wedding reception?
In both cases it will vary a lot. There’s a lot of “folk” Catholicism, so the traditions have a lot of local varieties. My family does not really have any at the reception (Polish background). Also, what would or wouldn’t offend people will vary. A lot of Christian denominations have the bride and groom walk in with their parents, instead of each other (to use a wedding example instead of a reception one), and while some parents might not mind doing it the RC way (where the parents walk in without their children, before the bride and groom walk in together), some parents might be offended.