Logo: The logo for the trendy wedding planner business could feature sleek and modern typography, incorporating a combination of elegant and contemporary fonts. To convey the trendy aspect, incorporate a stylish and minimalistic icon, such as an abstract representation of a wedding ring or a chic monogram. Use a color palette that is sophisticated yet playful, such as deep shades of purple or rose gold with pops of a vibrant, on-trend color like coral or teal.

Slogan: "Where Trends Come to Say 'I Do'" or "Your Trendsetting Wedding, Unveiled!"