Event Blast — how it works

You have ~600 Viber groups. Viber won’t let an app post into them.

Official bots can only message people one-to-one after they subscribe. Automating a personal account is against Viber’s Acceptable Use Policy and gets numbers banned. So Event Blast makes the safe path — posting yourself — as fast as a blast.

~600Viber groups to reach with the same invite

2channels: assisted Viber + email via Resend

1cross-checked confirmation list, per group

The whole workflow in four steps

Click each step — or use the buttons inside the mock UI — to see how a real event runs from Google Sheet to confirmed guest list.

Contacts & groups

Import from Google Sheets

Share as “Anyone with the link can view”. Columns: Name · Email · Phone · Group.

Google Sheet linkhttps://docs.google.com/spreadsheets/d/…/edit#gid=0

Group	Members	Emails
Import to see your Viber groups appear here

Your sheet is the source of truth. The Group column becomes the Viber checklist. Re-import anytime — people update instead of duplicating.

New event

Write the invite once

Same message for every Viber group and every email.

TitleSummer Picnic

WhenSat, Jun 14 · 12:00

WhereCentral Park, Main Lawn

Hi {name}!

You're invited to {event_title}
When: {event_date}
Where: {location}

Please confirm here: {rsvp_link}

{`{rsvp_link}`} required

Placeholders fill in per person (email) or per group (Viber). Each group gets its own RSVP URL so confirmations are attributed to the group they came from.

1 · Viber blast

Progress

0 of 4 groups posted

Next up

Choir Members

2 members on your list

Choir Members
Football Dads
Neighbours Block 12
Parents — Class 3B

Open Viber uses the viber://forward?text=… deep link — Viber opens with the text pre-filled; you just pick the group. Mark-done is automatic, progress persists.

Confirmations

Email blast

Personal RSVP link per person · Resend batches of 100

You’re invited

Summer Picnic

Sat, Jun 14 · Central Park

Tap a response to simulate Ana’s RSVP

Confirmed

Maybe

Declined

Headcount

Name	Group	Status	Via
Ana Petrova	Parents — Class 3B	No response	—
Boris Ivanov	Parents — Class 3B	No response	—
Carla Dimitrova	Choir Members	No response	—
Dimitar Georgiev	Choir Members	No response	—
Elena Stoyanova	Neighbours Block 12	No response	—

Cross-check: email RSVPs match via a personal token. Viber RSVPs ask for email or phone and match against your sheet (including 087… vs +359 87…). Unmatched replies get a review queue — link them or add as new contacts. Export CSV anytime.

Two ways people confirm. One guest list.

Whether they tap a button in an email or open the link from a Viber group, responses land on the same confirmation board — matched to your contacts.

Email → personal link

Each recipient gets a unique token URL with Yes / Maybe / No buttons. The token identifies them — no typing, no guessing.

Resend invite→ rsvp/<token>→ matched contact

Viber → public link

The group message carries a shared RSVP page. They enter name + email or Viber phone; we match against the sheet. Misses go to a review queue.

Group post→ /e/summer-picnic?g=2→ email / phone match

Assisted blast, not a banned bot

We chose the path that won’t torch your Viber number — and still gets through ~600 groups in a sitting.

No unofficial automation

Driving a personal Viber account with scripts violates Viber’s AUP. Bulk identical messages trip spam detection and permanent bans.

Fast enough to feel like a blast

Copy / Open Viber / auto-mark-done. Each group is a few seconds. Progress is saved so you can pause and resume.

Email still fully automatic

Where APIs exist (Resend), we use them: batch send, personal RSVP buttons, retry of failures, dry-run until you’re ready.

One invite.
Every group.
Who’s coming?