I replied, in my first post, saying Cadacs are usually fine - but ask the site! As I said, fire restrictions can mean thing change from week to week, so you really need to ask - email your sites to ask (most sites will reply in English to an English email), and you'll get an answer which applies to the sites you're going to visit, rather than just a 'general' answer which may not apply to your sites.
We've seen lots of people using Cadacs - but not on every site. We've seen people using charcoal - if there are no fire risk issues - but you really do need to ask the sites themselves, especially if they've already said that charcoal barbecues are 'interdit'.