Generally, the wedding planner does not come to the rehearsal dinner. However, if the wedding planner is a family member or close friend, they can come to the rehearsal dinner.
Of course, this does not apply if the wedding planner has a close relationship with the couple. In other words, if the wedding planner is your friend or family, they can come to the rehearsal dinner.
Generally, everyone who is present at the wedding rehearsal can attend the rehearsal dinner. Also, any married member of the wedding party can get an invite for their spouse.
Ordinarily, the plans and cost of the rehearsal dinner for a wedding are up to the groom’s family.
Generally, rehearsal dinners last two to three hours. So you may schedule yours to last within the same range.