Catering for 70ish people doable?

[Unusualllly]

Having a 50th birthday party in local town hall. 60-80 people coming.
Am I mad to do food ourselves? Invite says bring your own bottle.
Do we provide ice boxes at tables for thier own wine/beer?
Slow cookers filled with chilli, salads, bread and nachos in big bowls for folk to serve themselves?
Cake for dessert?
Will this work ok? The panic is starting, I've never had such a big party. Do we need entertainment or just music in background?

Thank you 🙏

It's do'able. But your'll need more than just slow cookers of chilli. Either make or buy sandwiches from Costco or a supermarket, sausage rolls and other bits, French stick. Cheese and biscuits. Cake. It'll be fine. Get a few beers, some wine and coke and lemonade aswell.