There are a lot of great venue options for large wedding groups in Cabo, it really depends on what you're looking for in terms of budget and location in the San Jose del Cabo/Cabo San Lucas area. A great route in booking a big wedding would be to choose a resort that can both serve as lodging for you and your guests as well as provide the venue space for your celebration -- when you go this route, many venues will actually offer free events, complimentary rooms and free upgrades. So you not only get a wonderful spot to vacation at, but it will also serve as the location for your wedding festivities.
Feel free to shoot an email to firstname.lastname@example.org -- Wright Travel Agency is the agency that owns and operates this website. Their team of agents have helped thousands of couples plan their dream destination weddings over the past decade and they have worked with with most of the resorts in the Cabo area, so they have great relationships with the resorts' events teams and are familiar with the different properties to ensure that you find the perfect location for your celebration.
Hope that helps!