As a guest attending a South Indian wedding, here are some attire suggestions based on different activities:

1. Wedding Ceremony:
For the wedding ceremony, women can opt for a traditional silk saree in vibrant colors like red, green, or yellow. They can accessorize it with gold jewelry such as earrings, bangles, and a necklace. Men can wear a formal attire like a silk dhoti with a shirt or a kurta.

2. Reception:
For the reception, women can choose to wear a stylish and elegant outfit like a saree, lehenga, or anarkali suit in any color of their choice. They can accessorize it with statement jewelry and carry a trendy clutch. Men can go for a formal look with a suit or a sherwani.

3. Mehendi/Sangeet:
For the Mehendi or Sangeet ceremony, women can wear a colorful salwar kameez, lehenga choli, or a fusion outfit like a crop top and skirt. Men can opt for a kurta with pajama or a dhoti ensemble.

4. Engagement:
For the engagement ceremony, women can choose a semi-formal attire like a saree, lehenga, or a stylish gown. Men can go for a formal look with a suit or a sherwani.

5. Pre-wedding Rituals:
For pre-wedding rituals like Haldi or Puja, women can wear a simple and comfortable traditional outfit like a salwar kameez or a saree. Men can go for a simple kurta with pajama or dhoti.

Remember, its important to respect the culture and traditions while choosing your attire for a South Indian wedding. Its always a good idea to check with the hosts or family members for any specific dress code or color preferences.