Well it would not be such a bad idea, but as you say trying to organise such a thing would be difficult :(
My Anilyn's cousin in London says that there is a Barrio Festival in London on Saturday and Sunday 14th and 15th July, I am hoping Anilyn will be back by then, but I will not hold my breath :( The venue is Hounslow Central
Entrance is free I believe and there should be lots of food and singing etc
I may try to make it down to london for at least the saturday :-)
Sorry I cannot verify this event, but my Fiancee's cousin would not lie to me would she?