I have been invited to a wedding in China, Chinese bride, American groom who has lived in China for last 4 years (family member)

Any suggestions on what to wear? Will give them a cash (check) present but would like to also bring a gift for them

There are 2 ceremonies, one in her home town, large metro area but not like Beijing or shanghai etc probably family
And a second in Guilin where they both work, probably friends
They will both be coming to the US in the fall for graduate school

I've been to China 3x but not for any thing like this!