The times of the wedding ceremony and the reception (主语)are （系动词）both（主语同位语） on the invitation（表语）.
However,you（主语） ought not to go to （谓语）a ceremony （宾语）because it only for close family（原因状语从句）.
If you really want to see it（条件状语从句）,you （主语）ought to ask（谓语） first（状语）.
Everyone （主语）can attend （谓语）the reception（宾语） afterwards（状语）.