The florist will hold the date until Friday. The couple liked two proposals and have not said which. Your assistant wrote a warm recap of both. Warmth is not a hold. Friday is a hold.
A vendor decision is a clock plus a taste. You can write the clock. You cannot sit them down. One briefing still goes to one mailbox.
One vendor, two options, a real Friday
Name the decision in the first sentence. "I need you to choose florist A or florist B by Thursday evening. I release the other hold on Friday morning." That is an honest deadline because it is the vendor's, not yours.
For each option: what they actually offer, what they cannot do, what it does to the rest of the day. Then your recommendation and the one fact that would flip it — a colour they have not confirmed, a ceremony time that moved. Do not send five names. Five names is a tasting, and you are not booking a tasting in this message.
RelayLink does not carry attachments. Describe the proposal: who sent it, the date, the two items that differ. If they need the lookbook, they already have it, or you send it where you already send pictures.
Write so one partner can carry it
Address the person whose inbox you are using. Say the other person needs to see the same two names before you treat a reply as the couple's. If you have both addresses, send the same ask twice, or send once and let them walk it across the table. Software does not convene a household.
Someone who is not on RelayLink still gets the briefing as email. If one of them already has an activated account, a new thread with that person needs an accepted pair. The other address may still be a cold send. The refusal will not tell you which door you hit.
A nickname you use for them in your list stays private. The package uses the names they use for each other and for the day.
You approve it; they reply from mail
You review the wording. They can answer from the email or the page. A sufficient reply is A or B, and whether both have seen it. If only one has, hold the release until they say the other has — or honour the Friday you wrote, and say so in the first message.
Mark the premises: the guest count you are using, the outdoor ceremony you still believe in, the colour they mentioned once. An assistant will promote a chat aside into a plan. Label the aside.
When this is the wrong tool
If they have not seen either vendor, do not ask them to pick from prose. Book the look. After they have seen it, send the same closed pair and the same Friday. The meeting finds the preference. The briefing records which hold you keep.