So, you may have 2000 members, but they may not all enjoy Archery. That means that only a percentage will even begin to consider your event.
Of the folks who will consider your event, you will probably have, at maximum, 10 people willing to help. And, for them, too, other things may take precedence on any particular day's event.
So, base your event on who actually will help, and what your crew can accomplish. "Over-promising" a 3D will lead to negative appreciation by participants, and lack of return. Promoting a basic event, but quietly building it to something more, will lead to participants being surprised and appreciative of your efforts, with a higher likelihood of returning.
"Strictly Sticks Traditional Archers" is a Traditional only Archery sub-group of the sporting club. We promote through the PA Bowsite, the Leatherwall, and through a very strong Facebook page. (Check us out.) We also have flyers printed (at no cost, as donated by a crew member) and distributed at various functions and Trad archery events. We maintain a "style standard" with our printed pieces, and try to give as much detail as will fit on the page. This includes everything from physical location of the shoot, to all costs, and a basic of the logistics involved.
"Strictly Sticks" has been averaging around 60-75 Archers per single-day 3D shoot. And our shooting months are November through March, the coldest months of the year. Our 2-day shoot, scheduled for September 8-9, 2018 for this year, averages between 100-150 attendees over the 2-day period.
We listen to what our participants comment on, and if there's an immediate problem, we fix it. If there's something that needs to be done for the next event, we make sure it gets done.
Working with, on average, 7 folks per shoot can lead to "burn out", but we try to get the crew members on the courses, too, to participate.
You mentioned you are having events, and asking what to look for as for participation. Something to consider: when you are talking about your event, NAME IT, WHERE IT IS, AND WHEN IT WILL BE in each posting or thread you comment on. As part of your crew, you'll need to build up name and event recognition, so folks can become familiar with who, when, and where you are. (Notice how I keep repeating "Strictly Sticks" / or "Sticks" as I write this....)
Let us, the PA Bowsite reader, know the details of your event, Tuck. Once folks realize there IS an event at your club, like the old saying, "If you build it, they will come...."