Separate Wedding Dance?

What do you mean by a dance? Will there only be dancing but no food/drinks and other reception like activities?

It's pretty common to have a ceremony and then move to a different venue for the reception so I don't think this will drive anyone mad. Especially since it is so close

I was thinking of having the dance with drinks/snacks at the 3rd location, and keep the meal/typical reception activities with the exception of the dance at the small hall next door. It would be somewhat split-up but neither location is big enough to accomodate for all activites.

OH I see so you want to have two locations simultaneously. Yeah this isn't the best idea and will drive everyone including you mad.

I would look for a reception venue that can accommodate everything you need for dancing and eating.

I don't think this is the most appealing idea. This also increases the amount of people who may leave after dinner and decide they'd rather go home than travel to a third venue. I think you need to talk to your FH and decide what is the top priority. Is it having the special place to dance? Is it guest comfort? Is it ensuring that more people will stay to the end?

It's your wedding day, there is nothing wrong with what you decide is the top priority; however, if you pick a priority that may be unpopular with guests, be prepared for the response. It's your day and you can plan however you like, but that doesn't mean guest have to be 100% thrilled by it.

I would strongly suggest you not do this but it is your day. I would recommend that you find a reception location large enough to hold the reception and have the dance.

Can the dance be done outside of the smaller venue? Sounds like that is the main down side.

As a notoriously slow eater, I would caution you that if you split up the reception, the wedding will not be able to move quickly to the third venue. Consider the time needed to set up decorations at a third venue, the time it'll take for people to get their meal and eat, and that many people will want to linger and chat rather than move on to the next place. I recommend consolidating the reception if possible.

I think it could work if worded and arranged properly.

Perhaps the invitations could say something like:

Wedding ceremony at 2pm ABC Church with a wedding meal immediately following in the church hall until 5pm. Dancing, munchies, and beverages from 5:30pm-8:30pm at DEF Hall, 123 xyz road.

People not interested in dancing will go home at 5pm and those that want dance will head over to the dance hall.