AFTER THE PARTY IT'S THE AFTER PARTY.
It's not uncommon for a venue to require that the entire premises are booked privately in order to have loud music. If this isn't in the budget, here are some great options for an after party if you want to just have the dinner and cake at one of the Villas. Even if the Villa allows loud music, keep in mind they may require the party ends by 10pm for noise ordinances, so keep these in mind if you'd like the party to continue!
Featured: AGROTURISMO CASTELLO DI VEZIO
On our things to do page, I recommended the hike to Castello Di Vezio, which is about a 20 min walk uphill from Varenna. The castle itself is a former medieval fort with stunning lake and alpine views. In addition to the castle, this area has a farmhouse, pool, and grounds surrounded by private apartments. I saw another wedding online where the couple rented out all of the houses, had their guests shuttled to Villa Cipressi for the ceremony & reception, but since Villa Cipressi has a 10 PM cutoff (with no music if you don't book it exclusively), they had an afterparty with a DJ & dancing under the olive trees at Agroturismo Castello Di Vezio. I've emailed with the owner, who is lovely, and will talk through pricing on a case by case basis. It does not appear that you need to be staying here in order to have a private party on the grounds. I think this is a great option at night, especially because you can't see the lake anyway, so why not dance under the stars and twinkle lights in a gorgeous olive grove!
Yep, you heard right. Converted from an old marble workshop, L'Orso has spacious indoor and outdoor interiors and a variety of local specialties, pizza, paninis, and a full bar. It is located in Varenna near the ferry dock, and has a license to be open until 2am (VERY unusual!) in the high season. Complete with a high quality sound system, it appears they more than welcome wedding after parties!
Beach clubs / Night Clubs
Lido di Bellagio and Lido di Lenno are beach clubs; serving drinks waterside by day and turning into night clubs at night. From booking out the venue entirely to just reserving a table for a smaller number of people, these are great options for after parties, given that a major part of their business is drinks & loud music!