Fourty to Fifty people went to Northwood HQ to enact the bases' bloody history [1], a smaller group of 9 people (and a very large dog) protested at RAF Molesworth [2] and a very motivated group of human nukes (and their mushroom clouds) visited USAF Lakenheath, USAF Feltwell and USAF Mildenhall [3].

For each event's full report :

[1]  http://reclaimthebases.gzzzt.net/nnews_82.html
[2]  http://reclaimthebases.gzzzt.net/nnews_85.html
[3]  http://www.theatreofwar.org/modules.php?name=News&file=article&sid=88

For more information on each base :
USAF Feltwell :  http://reclaimthebases.gzzzt.net/nbases_20.html
USAF Lakenheath :  http://reclaimthebases.gzzzt.net/nbases_13.html
USAF Mildenhall :  http://reclaimthebases.gzzzt.net/nbases_15.html
RAF Molesworth :  http://reclaimthebases.gzzzt.net/nbases_8.html
Northwood HQ :  http://reclaimthebases.gzzzt.net/nbases_0.html