State Sen. Marty Knollenberg (R-Troy) is hosting a Senior Tribute Lunch and Health Expo at the Royal Oak Farmers Market on Oct. 2.The annual event includes a free lunch, community program, raffle and more than 60 vendors with information on useful products and services for seniors.The event will focus on a range of issues, from health, physical activity, nutrition and community involvement to planning, entertainment, financial issues and quality care.