I've been in that situation a couple of times. The result wasn't great, mainly due to the repertoire being too much on the rock side and not having been sufficiently modified to fit the context.
Still it worked well enough to get us some paying gigs.
My advise is:
1) Don't try to overcompensate. No drums on the rhythm section doesn't mean you have to play their part, too. It actually means that you have less freedom to deviate from the main rhythm of the song.
So try to understand what the bare rhythmic foundation of the song is, and stick to that.
2) (almost) No slapping... IMHO, but it doesn't sound that good without drums. And really, we all know the story about how it started, but was it ever really
used that way?
So, avoid slapping unless it's for short embellishments and the like.
3)Double stops. They don't take anything from the rhythm and they can be very useful in providing a fuller sound, as a band.
4) No metronome!!! The little ticker is fine in practice but in a live situation it
will be a disaster. As mentioned already, time is every musicians job.
5) You are not the only one who has to compensate for the lack of a drummer.
Guitarists , too, have to play having in mind that the whole context is much less energetic and that their highly overdriven, tapped solo might not sound great without a driving percussive rhythm backing it.