We are having another cleanup weekend.
This time we will focus on:
fixing the rest of the broken images (most of this work has been completed)
cleaning up some more tags
The cleanup will last for 48 hours and will be running from 2017-04-08 00:00:00 to 2017-04-10 00:00:00 UTC. To see that converted into your local time, you may visit http://wwp.greenwichmeantime.com/.
Fixing Broken Images
One of the steps on Stack Exchange's road to HTTPS is the replacing of embedded http:// images with secure ones. This has been done automatically for a lot of images, but there are some that can't be automatically fixed. These were rewritten in the HTML (but not the Markdown source) to be text links instead of image embeds. It would be good to go through the affected posts and make images display correctly, or remove the link debris if they can't be restored.
To continually track our progress, we have a Google spreadsheet created by Ben N. (Even though all the links have /q/, answers are included too.) The Status column is editable by anyone, so please note your work there as you go along.
Look for variations of "Image no longer available" and "User screenshot no longer available" in the Status column to find posts that still need to be fixed.
Here is a list of 15 tag cleanup requests, one for each of the tags that are status-planned (approved by the community) for cleanup.
What you need to do is listed in the individual tag cleanup requests.
Our front page is likely to be filled with edits so using the questions page would be advised if you're not taking part in the cleanup. Apologies to any new users who've just come across this - it's not something we do very often.