Having been both the parachuter and the parachutee, let me give a slightly different perspective, and call you to exercise your charity and humility and what, in Lutheran Circles is called "putting the best construction on everything."
Church is not supposed to be about events, numbers and "getting it done", but about relationships, fellowshipping, and serving one another. Yes, the work you are doing is valuable and helpful, but is it possible - just a weeeeee tiny bit possible - that the contempt with which you view these ladies is just as "smellable" to them, as their "sabotage" is to you?
Is it perhaps possible that they are the ones who have to deal with complaints from the most-established members when your ideas strike them as frivolous, lackadaiscal, too-contemporary, or in some way irritating? Maybe they care about the syrup because they know who likes it best, someone who no longer has a loved one at home to do those little things for them?
Is there any chance that the staff complains behind your back that you expect them to drop everything and do things YOUR way, on YOUR schedule?
Is it possible that, rather than sabotaging you, they are trying to run interference for you in relationships and dynamics that you do not have the history to know about?
If you were in their position, might you find it tiresome for people who seem to have very little connection or investment in the group to parachute in and expect to be treated like the Whizz Kids who Make Everything Better?
Do you always - always - ALWAYS spend just as much time setting up chairs, picking up supplies, cleaning up trash, washing yucky dishes, getting papercuts from folding, fighting with glitchy computers, etc, as you do coming up with creative ideas and making suggestions? Or do you leave that to staff and "old biddies who have nothing better to do"
Do you know what their families and kids are going through, which one of them is showing up to work despite having a flare-up of her chronic pain, which of them has just been diagnosed with cancer, who has a loved one in the hospital, and who has taken a major hit to her retirement funds? Do you care? Have you asked?
Is it possible they have observed some or all of these things about you, and are exercising restraint to not say anything and do their best to help and make you successful, because they remember being you and know that someday you will be them?