Others will consider it a religious observance. Yet others will think or reflect, or just stand there. Use signs sparingly. For particularly long vigils, wither individuals or the group may wish to keep a diary of thoughts, conversations, and follow-up opportunities. This material can later be used for reports, etc.
Large vigils require careful organization and planning.
The larger the vigil, the more difficult it is to start. Avoid herding techniques that sometimes result when situations go awry. In brief sessions, as participants to help get things underway with patience and good humor.