“结婚仪式”常见的英文表达是 wedding ceremony。
“wedding”意思是“婚礼;结婚”,“ceremony”意为“典礼;仪式” ,二者组合起来就准确表达了“结婚仪式”这一含义。例如:The wedding ceremony was held in a beautiful church.(结婚仪式在一座漂亮的教堂里举行。)
此外,也可以说 marriage ceremony ,不过“wedding ceremony”使用更为普遍。