So I tried shooting a couple of events with a 35mm f/2 IS and 85mm 1.8 combination. Didn't go very well. 85mm was surprisingly not used as often as I thought. I could probably get away with 35mm for 80% of what I need to shoot, but I REALLY missed the versatility of a zoom.
So I think my ideal setup for shooting events is a zoom plus a fast prime. I am thinking of "upgrading" a bit, and within budget constraints, these would be the options:
(1) 24-70 f/2.8 II + 50mm 1.4 - I don't think I'd keep the 35mm if I get this 24-70, the 1-stop difference probably wouldn't help much. I'd ideally like to get a 1.4 lens in this scenario, and the 50mm would be the only one that fits the budget.
(2) 24-105 + 35mm 1.4 L - So keep my 24-105, upgrade the f/2 for the L lens.
(3) 24-105 + 35mm f/2 IS - keep equipment as-is, pocket the extra dough I'd spend.