5 years ago i believe they held em twice a week so that everyone who's staying at the hotel got to experience it at least once. IMO something you do once. Note the emphasis.
They do have safes its $5 a night to use also the foam party is wednesday night. Well that was last year should be same this year.
Foam parties are usually held near Phase II at the Oasis and the CLUB is called Up and Down. It is always held on a Thursday. Deffinately nice to experience once... I went once and once only in my 12 Trips. If you go I recommend bringing one of the mini towels to wipe the foam out your eyes. I never will go back personally because the foam itches, and it caused some discoloration on my trunks. The Oasis does provide room safes in each room free of charge...but if you want them to be effective you have to pay for the lock mechanism which is a little less than 5usd per night. It's deffinately worth it to buy. You may pay up front or be billed upon check out. It's not a good feeling if someone steals possessions from your room, you have worked so hard for. This is considered a Larceny although it feels like you were robbed.
well then i guess everything has changed since going in 09 or maybe i have forgot the day of foam party... but i would just go that once... but if you havent gone just go once to see what its all about!! and its free for safe WOW they charged me $5.00 a day for it.... o well