Yes you can still participate - just need to whitelist your address, add a minimum of 1 ETH and the equivalent amount of $LTX to the Uniswap LTX pool and do not remove the liquidity for 30 days.
Estimation because the numbers change with the liquidity pool (LP) size:
If the price doesnt go up more than ~75% then you will still have more ETH and $LTX after 30 days (and additionally earn on fee's).
In case it goes 100% up then you will end up having like ~1% less $LTX but still be net profitable (more eth).
Calculation:
Using a 50/50 IL (impermanent loss) model - let’s say you add liquidity at 0.75$ and prices increase to 1.50$ (100% price increase) the IL you would suffer would be around 6%.
1% (10,6 ETH = 24134 $LTX) of the pool earns 1000 $LTX atm which are 750$ at 0.75, or 1500$ at 1,50$.
6% IL would result in a reduction of 1320 $LTX.