Hi @kina, how did the wedding go?! Curious to know what you did and how it turned out.
It if turned out to be a cloudy day, then I don’t mind shooting toward a window without any fancy lighting and completely blowing out the outdoor texture. Of course, this often results in fuzzy edges around the subjects, but it can be used as an artistic effect for like portraits of the bride. Otherwise, cheap speedlights through umbrellas as Ezra explained are certainly the way to go.