Every Monday at 8:00, find active subscriptions whose original start date has a 6-month or full-year anniversary in the next 7 days. Use the subscription's start date, not its renewal date or the start date of any single item. Skip subscriptions that are canceled or expired.
Email [your email address] one summary listing each member or company by full name, with the milestone, the date, and a simple gesture suggestion. If there are none, do nothing.
Never contact the member, and never change subscriptions, prices, or discounts.