Why do you need that? Although I assume that will, perhaps, help you predict how many donations you might get and thus plan the annual budget? If so, I can't help you. I just don't know. Find some software developers, maybe.
I guess there can be a simpler solution. I assume you have building cameras, right? If you use venue crowd counting with cameras then you will be able to analyze how many people are visiting you on a monthly basis, for example. You can see what influences the visits or no shows and what emotions people have. I am sure this will help you with the budget, as Mrs. Rusanna said.
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What the heck are you talking about? What software development? I just need software to be found for handling online conferences. Preferably not custom-made. I am on a budget, if you didn't know.
Don't fight, brothers. The way out is normally where the way in is. And I see no reason for panic. Last week we used Digital Samba Video API so all you need to do now is go and sleep. In the morning you get to the office and call them straight away. I guess it won't take ages to set up a conference. Just play it cool.