Lots of the following:

Potties...include hand wash stations and ample garbage cans.

Shade...Trees, canvas, tents, tarps, gazebos, etc. Shade umbrellas should be at the back of the audience, not obscuring the view of the stage(s). All stages should be covered, no exceptions.

Water...Bottled and garden variety hydrants.

Garbage containers...Everywhere, and emptied before they're overflowing. Remove all trash from the festival site every day. I witnessed Sunfest in London Ontario this year and they had a huge group of overflowing dumpsters in one corner of the park. They stunk and attracted flies, poorly representing the festival intent.

Visible festival management...Includes lost children service, first aid, disabled patron service, emergency phone, discreet police presence, parking management, shuttle service, volunteer management, and so on wherever applicable.

Instrument security service for music performers...My local festival provides it for free so that musicians don't have to walk about with cases at the ends of their arms all the time.

Ample backstage area...For dressing, washrooms, tuning, and privacy away from the public before performances. Should also be sheltered, and maybe connected to an hospitality service.

Ample lighting...It's dark at night, you can tell by looking, but some organizers don't look.

Signs...And an accurate site map in the program. "Which stage is this" is too common a refrain.

Minimize junk food...And food could reflect the festival theme somehow.

If the venue must have booze, contain it, licence it, control it, and evict drunks and disturbances. If you must have booze at least get some sponsorship dollars with it.

Children's activities...crafts, games, performances, supervision, breastfeeding tent, diaper changing area, playground, workshops.

Workshops...A zillion ideas, but keep them on point. Hands-on workshops are cool for those who want to learn/experience. Performance workshops are great for folks who want to see an act again or instead of another.

Control sound bleed...Aim stage sound, buffer zones, lower volume, distance between stages, scheduling of loud acts, etc.

Seating...Not everyone can carry their own chairs, particularly the elderly. Picnic tables, park benches, bleachers, loaned municipal chairs...

Grass...I played a festival in a parking lot once. Worst show I've ever been a part of.

Community co-operation and involvement...be inclusive no matter how much you want to exclude something or somebody. Within reason naturally.

Site security...Private security company, police, volunteers, or whatever it takes to guard the place overnight. My local festival used a private operator one year and the one "officer" was found in the offsite pub when he should have been working. Thank goodness there were still staff on site. Keep an eye on them.

Local services...Keep in touch with the tourist bureau, accommodations, campgrounds and so on regarding the influx of visitors. Ask the municipality for services like water, trash, electrical, and whatever they'll provide for free or cheap.

Without mentioning performer related concerns (I'm getting tired of typing...maybe later), whatever you do don't use the festival to line your own pockets. It should be about community, folk.

Peace, Mooh.