AltiAction Donate $15 for $30 Alti Dollars - Starts May 24

There are a few good Altitude Sports deals in the pipe making it worthwhile to plan ahead, best for things that typically don't go on sale or get low/no stock by the time they do

1. May 10 - 16, 2022 - Altitude Sports Spend $125 get $25 - https://www.altitude-sports.com/collections/spend-get
Credit will be sent May 17 and valid until May 31
2. May 14 - 16, 2022 - Rakuten 10% cash back (until 9pm PST) - https://www.rakuten.ca/altitude-sports.com
3. May 24, 2022 - AltiAction $15 for $30 Alti Dollars which never expire - https://www.altitude-sports.com/pages/alti-action-organization

For the simplest play, purchase at least $125 today and get $25 + 10% cash back, and on May 24 spend $15 to get $30 and buy something else.
If what you're buying is >= $125 and you have something else you want that is < $125, then do the above.
If what you're buying is < $150 and you don't have anything else to get, then just do AltiAction
If what you're buying is > $150 then regardless of whether you have something else to get you should just buy it today w/ 10% cash back

Even better if you already have expiring credits to spend, plus you get $10 credit when you review your purchase

Note: value spent with credits subtracts from the total reported to Rakuten for cash back so it is technically best to use credits when there is low cash back
Ex. if 10% cash back and you spend $70 credits on a $100 item, you'll only get $3 in cash back for the $30 remaining after credits are deducted, missing out on an additional $7 cash back. If you did this when cash back is only 2%, you'd only miss out on an additional $1.40 cash back.

Edit: YMMV with cash back and expirable credits which may void cash back - see post here
A good general rule is if possible split your purchases into multiple orders and use expirable credits on the lowest priced orders.

Edit: Rakuten cash back is now back down to 2%, and Altitude Sports spend $125 to get $25 is over
Now you need to spend > $750 in order for Rakuten cash back to be more worthwhile than AltiAction and that's assuming you have at least 2 different items you want to get. If you only have 1 then just wait for AltiAction.