For small events of 100 guests or less, consider Sidecar Cocktail Parties. Greg and his bar crew operate a mobile speakeasy styled bar service, using only homemade (or handcrafted, artisanal goods to use the current parlance) mixers in addition to high-end spirits. Sidecar specializes in classic cocktails of the prohibition era, and delivers a perfect drink in every glass. Definitely the best bar I’ve ever seen at any wedding or corporate event.
If you’re hosting a large event, and/or want more of a standard-grade cocktail experience (think Jack & Coke, Gin & Tonic), Gianni and the Pacific Coast Events crew are probably the right group for your job. Professional and experienced, they get the job done.