RD for OOT

just want to ask how u invite the OOT for the rehearsal diiner....will u send an invite or just tell them personally, sumting like that,.If youre sending an invite, what will u put....like

We would like to invite you for the rehearsal dinner at ...........(somthing like this) ,,,,,,,

thanks in advance.

we sent out invites about a month before with the rehearsal info and dinner info