Rolling two days in a row wouldn't be ideal. Possible? Sure, if it's only once this year, you have a long break after, don't dose too crazy, eat well, stay hydrated and get good sleep.
I'd probably do MXE all weekend, MDMA on the Saturday night, then finish up on Sunday morning after the roll with nitrous and weed (the nitrous brings the roll back a lot for me, ~300mg + nitrous lasts the whole night for me).
Maybe some more MXE / weed on Sunday night if you really feel inclined, but I would rather just enjoy the last day without.
Edit: MXE + MDMA might be dangerous, but I've had no trouble in the past. Switch for Ketamine if worried.
But again, rolling two nights in a row, not a great idea. Use something else.