There are actually quite a lot of events happening locally as part of the Sydenham International Music Festival (many of the events take place in SE23).
Brockley Max starts at the end of this month.

This Sunday is Bali Day at Horniman: http://www.horniman.ac.uk/events/bali.php and there are many other events taking place there, although Forest Hill Day will not take place this year due mainly to the almost complete closure of Horniman Gardens while they spend £1m improving it.

2nd July is not just the Blythe Hill Festival but also Forest Fest at Forest Hill Boys School.

The Forest Hill Society are working on planning for the 2nd Pop-up event for July across Forest Hill town centre.

Further details of events can be found at:
http://www.foresthillsociety.com/p/calendar.html


I'm sure it would still be possible to organise a Forum pub night. They do these regularly on the Sydenham Forum and I don't see why we don't organise one for SE23.com.