What's on in London this weekend, and how to find out?

[aprilwotson]

We live in SW London and find ourselves at a loose end this weekend, without the kids. I've just been looking at the TimeOut website but having clicked through a few pages I couldn't see any listings by date (maybe I missed it). So, two questions:

1. Can anyone recommend a good comprehensive Whats-On site that is simple to filter by date and other criteria?
2. Any destination or event recommendations for Friday or Monday? We like a walk, so the Thames Path is always our fallback. We've done most of the museums/galleries.

Time Out London

This page -they update every week.

www.timeout.com/london/things-to-do-in-london-this-weekend

What about doing the jubilee walkway? Walk between Little Venice and Camden is always fab.
Paid or unpaid for activities?

Secret London

Paid or unpaid - I already checked out potential for Good Friday theatre matinees, but couldn't find anything we hadn't already seen or want to see.

Battersea power station looked like they had a few Easter things on when we were there last week

Thanks, I saw that, but it's just their own promoted selection. I was hoping to filter full listings by specific date and other criteria. I'm sure it used to be possible.