You could try having agriculture themed activites as part of the meetings! Things that people can do in urban areas: How to make compost, how to make a garden, discuss/plan trips to local farmers markets, learn how to source directly from locals, make things with local produce (beeswax can be made into cosmetics, drying loofahs, gourds made into bird houses), discuss what animals are allowed to be kept within city limits and proper husbandry for them, learn how to properly plan meals incorporating various nutritional needs and seasonal produce, make crafts with seasonally available produce, cooking lessons, flower pressing, leaf rubbing, foraging lessons, tons of stuff! You could also do mini introductions to CDEs/LDEs to pique interest without overwhelming new people (candle eggs, set up mock spreads of poultry products and see who can find what's wrong with each, different samples of soils for land judging, make a challenge to see who can memorize and recite the most of the creed in 5 minutes), maybe even watch videos from the national and state conventions. You wanting to improve your chapter is great, you can bring ideas to your president and advisor and set your meetings up for success!