Congratulations on upcoming nuptials! We had our daughters wedding in Summit County a few years ago ( Silverthorne)
A few hints that helped our guests. Try to fly into Denver and acclimate at least overnight or possibly longer. Really helps to make the adjustment for higher altitude.
Purchase and use a high quality pulse oximeter to monitor your O2. Sea level
usually 95-99, O2 will drop to low 90s at 9000 feet. Lower than 88, seek
medical help. Advice against taking long walk the first day at altitude. Sorry. No alcohol the first day or two, if at all.
There is an Oxygen Bar in Breckenridge- drop in, purchase a mask which you take with you, receive O2 at bar.
Also medical O2 available. Consider having your doctor give you a prescription which can be filled in aDvance and delivered to you in a Breck. One of our guests felt lightheaded on day 2. Her pulse ox reading was 85. We took her to urgent care- they arranged to have a tiny nasal cannula with its own supply of O2 delivered to her rental condo. She took the cannula everywhere for 5 days and breezed through rehearsal dinner, wedding etc
Best to make all arrangements for supplemental O2 in advance!
Many sources available. Please feel free to PM for more information!
Wishing you a healthy and joyful celebration! Hannah