April - Aguascalientes, Aguascalientes .
Dedicated to San Marcos, this fair in the state capital of Aguascalientes features local food and beverages, as well as cockfights, bullfights, and a lavishly decorated plaza. Said to be the largest fair in Mexico, there is a constant schedule of dances, processions, and exhibits.
In recent years a wine pavilion has been set up where the major local producers (and Aguascalientes has grapes in its coat-of-arms) including, naturally, the San Marcos company, vie to press free samples of their best vintages on visitors.
Details about the wine faire, here:
May - Tequisquiapan, Queretaro, National Wine and Cheese Fair.
Taste Mexico's best wines and cheeses, and try some delicious local dishes, in this charming little town, 12 miles from San Juan del Rio and easily accessible from the Mexico-Queretaro toll highway. Cheese making, an honored tradition here, has expanded in recent years to include some gourmet varieties.