A co-ed bridal shower is usually more a?get together or party?than a shower. For a co-ed bridal shower having a barbecue is popular, but a formal afternoon tea might leave the guys feeling bored. Guys aren't usually interested in the "normal" bridal shower events, such as opening gifts, and might get bored during this part so having another?activity for the guys during this?time will make for a better celebration. Setting aside a place for the guys to talking "guy stuff" and maybe smoke a cigar in celebration with a drink would be a good option during the "girl type" events.?
Depending on the group of guys invited, games maybe out for them as well. There are plenty of bridal shower games that work well for a co-ed shower though, so if you think the guys might be up for it you might want to give it a try. Asking the bride her ideas on the subject will help, she probably knows if her soon-to-be husband will be accepting to the games or what types of things he would enjoy, too.