If you are looking for a full show backup then the way Pie4Weebl suggested is best. Use small UPS's to backup things like the boards and any comms you have. Then if power drops out the generator kicks in, you may see a flash of darkness as the switch over happens but as long as your boards don't go down it should continue just fine.
As has been said, high amperage UPSs are impractical. In my experience, nationally televised award shows, PPV events, and the like will use generator power as MAIN and house/local POCO utility as BACK-UP, with switchovers/transfer switches that are more likely to be manual rather than automatic.
Some companies that specialize in such systems specifically for the entertainment industry:
Saunders Electric - Hollywood Entertainment Power: Generators, Transformers, and Green Energy
Temporary Power Solutions | CAT Entertainment Services
Legacy Power Services
At an old job I had an opportunity to work on noise and vibration control for numerous backup power systems from single smaller gen sets to facilities that looked like someone pulled several locomotives in and took the bodies off. During that period I saw UPS systems for data centers that did just what you describe, if incoming power service went outside certain parameters the system automatically kicked onto the batteries, a big room full of racks of batteries, and if the incoming service was not restored within a certain time then the generator fired up and once that was up and running the power transferred over to the gen set(s). However, such critical applications are the only facilities I've seen incorporate that intermediate step.
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