Siddhivinayak temple in Prabhadevi on Angarika Sankashthi Mumbai. The Sankashthi, which falls on a Tuesday, is called Angariki. It's an auspicious day to worship Lord Ganesha.
What are darshan timings in Siddhivinayak temple?
The pooja commences at midnight and darshan will continue from 1.15 am to 3.15 am on Tuesday morning. The temple will be closed for 15 minutes to clean the premises and after the first aarti at 3.50 am, darshan will continue uninterruptedly till 8 pm.

What is abhishek timings?
There will be an `abhishek' and `pooja' from 8.30 pm to 10 pm for which the temple will again be closed. However, the ceremonies will continue to be broadcast on the screens. The temple will be opened again for darshan at 10 pm which will continue till 3 am on Wednesday.  source TOI

Angaraki chaturthi Pooja viddhi and Mahatmya श्री अंगारकी चतुर्थी पूजाविधी

Where Can I see Live darshan or live webcast of Shree Siddhivinayak ?
View live Webcasting of the Shree Siddhivinayak Temple, watch siddhivinayak live darshan from siddhivinayak.org
Mumbai siddhivinayak live darshan, siddhi vinayak
BIG 92.7 FM has announced that it will broadcast live from Mumbai's Siddhivinayak Temple every Tuesday morning .The show, called 'Mangal Murthy Morya'  Hindi Live FM !! - Click Here

ONLY LIMITED NUMBER OF PEOPLE CAN VIEW THE WEB CAM AT A TIME, SO PLEASE BE BRIEF AND  CLOSE YOUR SESSION AFTER ONLINE DARSHAN SO THAT OTHER PEOPLE CAN AVAIL THIS
LIVE DARSHAN.

You can also take "Virtual Darshan" of Shree Siddhivinayak.

'Mangal Murthy Morya'  Ganpati Bappa Morya