Wedding evening invitations for the afters are recommended so as to include all your distant relatives and friends in your celebrations. They should ideally be issued at the same time as the wedding invitations so as to avoid offending some people who might otherwise feel left out and this way everyone is very clear as to who is invited to what etc.
The wedding stationery theme can be maintained in the wedding evening invites. A good idea is to use one side as a song request slip if you wish. It is also advised to be very clear about the arrival time and be sure to give it some thought when deciding so as to ensure people do not arrive too early or too late.