In all honesty, you're probably best off making one of the choices a recognizable macrobrew. If it was my wedding, I'd want to make sure that all of the guests have a familiar option that they can rely on.
If you serve an IPA, chances are many will complain about how much the beer sucks. Yuengling would be my pick for a very mild beer (not sure if it qualifies as macro but you get the idea).
For the other beer though I'd think either a saison or a wheat beer would be a good pick. I don't know if you can find these very easily in your area, but Allagash White or Goose Island Sofie would be my picks. Both are really drinkable and accessible, and also good beers.
You might go for a "macro" taste profile and not an actual macro brand. By that I mean get a style that is close to American-style Pilsner or American-style Lager as possible. Sam Adams Lager or Brooklyn Lager (for something local) might be good choices.
Allagash White or Bells Oberon would be really good choices for the second beer if you want to keep that accessible and you want to be able to buy a lot of it.
Sofie is a great choice, but I bet a lot of people will turn their noses up at the tartness.
You could do a blind tasting for your bachelor party (assuming you haven't had it yet). Invite your friends who like Miller Lite and find out where the middle ground is. Put Miller Lite side by side with Sam Adams Lager, Brooklyn Lager and Victory Prima Pils.
Have your guests rank them from favorite to least favorite on a piece of paper.
A saison at a wedding for a generic crowd is a terrible idea, unless you want to turn people off of beer.
American saisons are rarely of the caliber of French/Belgian versions.
They are usually even higher ABV than the already inflated European versions, underattenuated, usually low on wheat, and low on carbonation. Most American craft breweries treat saison as slightly drier and spicier Tripel, which is absolutely not the case. Even BJCP doesn't know what a saison is.
Phil Markowski's "Farmhouse Ales" gives a wonderfully rich history of the style.
Read the other responses here, presumably from Americans.
"These may be a little on the high abv side".
No, saisons should be between 3-5%, unless you're making an imperial interpretation.
I make a 4.5% saison for summer BBQ's at the house and everyone gobbles it up like thirsty working class plebs, so I see no reason why a wedding would be any different. It's great.