Today there are two live help events taking place, one on the paid search side and the other on the organic search side.
The Google AdWords team is hosting a webinar today at 3pm GMT (which is in about 2.5 hours from now). The AdWords webinar is on making mobile-friendly websites. You can still register for it by clicking here. It is a shame they aren't using Google+ Hangouts for it but I guess they can host more people this way.
The Google Webmaster team is hosting a Google Hangout today and tomorrow on Webmaster topics. The first one is today in about an hour and a half, at 2pm GMT. The second one is a week from tomorrow, March 21st, at 2pm GMT. No registration is required but you need to be one of the first ten. To get in, a few minutes prior to the start time, go to Pierre's Google+ page and watch it.