You do not have to invite the same people that go to your marriage ceremony to your wedding reception, but it is often customary. After all, the people who are at the ceremony often go straight to the reception. If some people go to the reception, and others who are not invited see this, they can find it to be quite rude.
Also, wedding invitations typically have the location of both the ceremony and reception on them. If you send out invitations which are missing the location of the reception, you will probably be hurting the feelings of the people who are invited. They might wonder how you are choosing who to invite where.
If you cannot afford to hold a big enough reception for everyone at the ceremony, you might be better off having a smaller wedding with only a few guests. You can then tell everyone that you are not inviting that you are just having a small ceremony to save money. They will probably understand this better.
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