I run sound for my church and have run a number of outdoor programs. Also, I have listened to many wedding setups and provided the sound at my son's wedding for over 400 guests in a medium sized banquet hall. I have also been to dances at large ballrooms for over 600 people.
Your Altecs are great speakers but they are older units for local monitoring or playback in closed rooms. Although highly efficient, they do depend on room/boundry gain for bass below about 60 hz, and they were built/developed before really modern techniques and adhesives were used for big time/big power PA work. With a true 100W power limit, you're going to be really placing these speakers at risk in an outdoor environment and only using two speakers, unless its a fairly small area you're covering (say 1000 sq. ft or less).
One of the biggest problems you'll face is the fact that current music has a lot of low frequency and subsonic crap that loads the system at 60hz and below. IIRC, this will be below the loading of the horn and vents and overdrive the Altec woofers easily. Also, with some "Unknown Kid" who cannot hear distortion running the sound board, unless you have a limiter, this kid is going to push the system as hard as he can, especially after a few drinks, audience urging, and trying to get the most "BUMP" out of the speakers. He's not going to care if he blows your amp(s) or speakers until they fail. The amps will be overdriven since all of them run less than 150W/channel and the risks of distorted output to your speakers are huge.
IMHO, save the speakers for the BBQ, party or smaller gathering. If you have a big wedding party, with modern music, and an uncontrolled DJ, its best to rent a big JBL PA system with separate subwoofers, an elevated set of woofer/mid/tweeter-horns, and at least 4 channels of 200-400W/channel pro amps or more to run each speaker separately.
Do not bother with the EON or other powered systems, they are convenient but compromises at best. Use pro/DJ type JBL gear that can run all day at the SPL's needed.
Why risk your gear IF it may be somewhat undersized for the mission? I am assuming you will need large scale coverage. If you have more information or some pics of the proposed venue, how many people will be there, and how large the area needing coverage, then we can be more precise.
Oh, and be absolutely sure you have dedicated high power (15-20 amp outlets on possibly multiple circuits) that will service only the sound system, and that all cordage is completely secure, taped or covered, and inaccessible to anyone else. Disconnection transients can cause big problems.
This is what I used for my son's wedding for the main system, 2 4648 Double 15 JBL subs, plus 2 JBL 4612B's for mids and top, plus 2 more 4612B's for side fill at the extreme ends of the rectangular hall, all pushed by 4 Yamaha PC2002M 240W/ch pro amps from a Tascam Mixer and Yamaha electronic crossovers, sound was clear, articulate, and loud as was needed, easily pushed 200W peaks on the meters: