look at the Kremona pickup. It slides under the strings loops on top of the bridge, no alteration of the instrument. It uses a 1/4" jack one the amp end, so can go into a nice processor before the amp or PA system. I sounds remarkably good if EQ'd well, and costs only about $70. If you want a mic, try to find one that clips into the soundhole, you'll have less trouble with wind noise and setup. They are made by Audio Technica for around $150, I think. They will need an adaptor for a guitar amp (most of which will never sound good at all, since they are voiced for electric guitar). You'll want an "acoustic" amp, weird as that concept is; they are voiced more high-fidelity. I have used the Roland AC 60 for years for outdoor weddings and small spaces, pretty nice, small, and has a mic channel as well as a 1/4". If you're doing a lot of functions and restaurant work, get a speaker stand for it, put it above your head and the sound will carry further without volume problems. Oh, and the Kremona can make any guitar sound quite good, so if you have a "club" guitar or don't want to risk your concert instrument, use the Kremona. After all, once you've amplified, mic or pickup, you're playing electric guitar.
Lester Devoe Flamenco Negra
Lester Devoe Flamenco Blanca
Aparicio Flamenco Blanca with RMC pickup
Bartolex 7-string with RMC pickup
Giannini 7-string with Shadow pickup
Sal Pace 7-string archtop