Simple:
* The annual summer festival was a real extravaganza of music, food, and fireworks.
* The circus was an extravaganza of colorful costumes, daring acts, and animal displays.
Descriptive:
* The opening night of the Broadway show was a dazzling extravaganza of song, dance, and spectacle.
* The royal wedding was a grand extravaganza, complete with a horse-drawn carriage and thousands of guests.
Figurative:
* The chef created an extravaganza of flavors on the plate, combining exotic ingredients and bold seasonings.
* The company's new marketing campaign was an extravaganza of creative ideas, pushing the boundaries of traditional advertising.
With a specific subject:
* The casino held an extravagant New Year's Eve extravaganza featuring live music and a champagne toast at midnight.
* The fashion designer presented an extravagant collection of gowns, each more elaborate than the last.
The best way to use "extravaganza" depends on the context and the tone you want to convey. It is often used to describe something grand, spectacular, and entertaining.