According to a Jain 2026 calendar, May 8, 2026 does not list any major kalyanak for that date. Kalyanak observances are generally based on the Jain lunar tithi and can vary by tradition and calendar, so for this Gregorian date there is no widely noted kalyanak in the calendar I checked. ( jaincenter.org)

If you mean a specific Tirthankar kalyanak, it is not marked on May 8, 2026 in that Jain calendar. ( jaincenter.org)