curl --request POST \
  --url https://api.sailhouse.dev/topics/{topic_slug}/events \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "data": {},
  "metadata": {},
  "send_at": "<string>",
  "wait_group_instance_id": "<string>"
}'

{
  "id": "<string>"
}