Weather in southern Spain is a temperate Mediterranean climate with the late winter temperatures ranging from the high 50's to the 80's. The weather tends to be lovely in March, but be prepared for some rain, as the weather is always a mystery.
The official currency in Spain is the Euro. You may choose to buy Euros from your bank at home before travel. ATM's tend to be a reliable choice for getting local currency worldwide. Remember to inform your bank that you will be traveling internationally before your journey begins, so as to avoid problems withdrawing money overseas. Credit cards are accepted in most shops and restaurants.
Regular flights are available to Seville (SVQ) from most major cities in Spain and Europe. You may choose to book your flight directly to Seville (through Madrid, Barcelona, Amsterdam, London, Paris, etc.). Or you may wish to travel by ground from other Spanish or European destinations. Consider scheduling yourself some time upon your arrival to Seville prior to the workshop to discover the city.